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WPF XAML Styles not applying properly (.NET 5)

I'm trying to apply 2 custom styles to 2 Buttons on a UserControl.
Here I have the Styles defined in a Buttons.xaml ResourceDictionary which is properly registered as a ResourceDictionary in App.xaml.
<!-- Contained button -->
<Style TargetType="{x:Type Button}" x:Key="MaterialContainedButton">
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Background" Value="{StaticResource PrimaryBrush}" />
<Setter Property="Foreground" Value="{StaticResource ForegroundLightBrush}" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="Padding" Value="8" />
<Setter Property="MinWidth" Value="64" />
<Setter Property="Height" Value="36" />
<Setter Property="Cursor" Value="Hand" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border
Padding="{TemplateBinding Padding}"
Background="{TemplateBinding Background}"
CornerRadius="3">
<TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="Medium" Text="{TemplateBinding Content}" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="{StaticResource PrimaryLightBrush}" />
</Trigger>
</Style.Triggers>
</Style>
<!-- Outlined button -->
<Style TargetType="{x:Type Button}" x:Key="MaterialOutlinedButton">
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Foreground" Value="{StaticResource PrimaryBrush}" />
<Setter Property="BorderBrush" Value="{StaticResource PrimaryBrush}" />
<Setter Property="Padding" Value="8" />
<Setter Property="MinWidth" Value="64" />
<Setter Property="Height" Value="36" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border
Padding="{TemplateBinding Padding}"
Background="{TemplateBinding Background}"
BorderThickness="1"
CornerRadius="3">
<TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="Medium" Text="{TemplateBinding Content}" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="{StaticResource PrimaryBrush}" />
<Setter Property="Foreground" Value="{StaticResource ForegroundLightBrush}" />
</Trigger>
</Style.Triggers>
</Style>
And the two Buttons on my UserControl are defined as follows:
<StackPanel
Grid.Row="2"
Grid.ColumnSpan="2"
Orientation="Horizontal"
HorizontalAlignment="Right"
VerticalAlignment="Bottom">
<Button
Style="{StaticResource MaterialOutlinedButton}"
Content="CANCEL"
Margin="10"
/>
<Button
Style="{StaticResource MaterialContainedButton}"
Content="SAVE"
Margin="10"
/>
</StackPanel>
I have 2 problems with this code:
For some reason the BorderThickness Property in the second style doesn't apply to its respective Button.
The Buttons differ in Height although they should have the same Height based on their styles
All other styles in my Buttons.xaml file work just fine, it's just these two that just don't seem to work as they should. If anyone has any idea how to solve this issue I would greatly appreciate it.

Change BorderBrush when button IsPressed

I'm creating a WPF application for a touchscreen.
There should be a button on the screen with an Icon (image).
The code below shows how the button should look like.
So far so good..
What I would like to achieve is that when you press the button, the first BorderBrush color should change from “#0070b8” to “#00395c” and the second BorderBrush color should change from “#e3e3e3” to “#727272”.
Could someone please help me how to achieve this?
<Button Width="64" Height="64" Grid.Row="1" Margin="1,1" HorizontalAlignment="Left" VerticalAlignment="Top">
<Image Source="Resources\Home_Icon_2.bmp" Width="54" Height="54"></Image>
<Button.Style>
<Style TargetType="{x:Type Button}" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border CornerRadius="6" Background="{TemplateBinding Background}" Name="button" Width="64">
<Grid>
<Border BorderThickness="0,0,2,2" BorderBrush="#0070b8" CornerRadius="{Binding ElementName=button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="1" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<Border BorderThickness="2,2,0,0" BorderBrush="#e3e3e3" Opacity="0.5" CornerRadius="{Binding ElementName=button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="1" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<ContentPresenter TextBlock.FontSize="{TemplateBinding FontSize}" TextBlock.FontFamily="{TemplateBinding FontFamily}" TextBlock.Foreground="{TemplateBinding Foreground}" VerticalAlignment="Center" HorizontalAlignment="Center" Content="{TemplateBinding Content}"></ContentPresenter>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="button" Property="Background" Value="#e3e3e3" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Background" Value="#c6c3c6" />
</Style>
</Button.Style>
</Button>

You could always set the brush color in your click event:
private void btnYourButton_Click(object sender, RoutedEventArgs e)
{
btnYourButton.BorderBrush = (Brush)new BrushConverter().ConvertFrom("#00395c");
}

This would be one solution. Note that we've assigned our brushes to separate resources so that we don't have magic numbers in our style. This is ideal for when you need to use the same colour scheme across multiple controls, and saves a lot of time when you want to change said colour scheme.
<Style x:Key="AdtakrButton" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Name="ButtonBorder" CornerRadius="5" BorderThickness="{DynamicResource AdtakrButtonBorderThickness}" BorderBrush="{DynamicResource AdtakrBlack}" Background="{DynamicResource AdtakrWhite}" Margin="{DynamicResource ButtonMargin}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="6,0,6,0" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource AdtakrGrey2}"/>
<Setter Property="BorderBrush" Value="{DynamicResource AdtakrGrey2}" TargetName="ButtonBorder"/>
<Setter Property="Background" Value="{DynamicResource AdtakrGrey1}" TargetName="ButtonBorder"/>
<Setter Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="{DynamicResource AdtakrGrey2}" TargetName="ButtonBorder"/>
<Setter Property="BorderBrush" Value="{DynamicResource AdtakrGrey2}" TargetName="ButtonBorder"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background" Value="{DynamicResource AdtakrLightBlue}" TargetName="ButtonBorder"/>
<Setter Property="BorderBrush" Value="{DynamicResource AdtakrLightBlue}" TargetName="ButtonBorder"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="FontSize" Value="{DynamicResource AdtakrDefFontSize}"/>
<Setter Property="MinWidth" Value="90"/>
<Setter Property="Height" Value="40"/>
<Setter Property="ToolTipService.ShowOnDisabled" Value="True"/>
</Style>
If you need to have it change between more than 1 colour, then your best bet is to have a command on your databound VM and the command changes a colour property that the button also binds to. Alternatively, if it's supposed to reflect 3 states, using a toggle button with the three state option is probably your better bet, as then you can set triggers against the IsChecked property of the button.

Found the solution!
By giving the borders a name and then they are accessible in the Trigger Property
<Button Width="64" Height="64" Grid.Row="1" HorizontalAlignment="Left" VerticalAlignment="Top">
<Image Source="Images\Home_Icon_2.png" Width="54" Height="54"></Image>
<Button.Style>
<Style TargetType="{x:Type Button}" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border x:Name="button" CornerRadius="6" Background="{TemplateBinding Background}" Width="64">
<Grid>
<Border x:Name="border1" BorderThickness="0,0,2,2" BorderBrush="#0070b8" CornerRadius="{Binding ElementName=button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="1" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<Border x:Name="border2" BorderThickness="2,2,0,0" BorderBrush="#e3e3e3" Opacity="0.5" CornerRadius="{Binding ElementName=button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="1" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<ContentPresenter TextBlock.FontSize="{TemplateBinding FontSize}" TextBlock.FontFamily="{TemplateBinding FontFamily}" TextBlock.Foreground="{TemplateBinding Foreground}" VerticalAlignment="Center" HorizontalAlignment="Center" Content="{TemplateBinding Content}"></ContentPresenter>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="button" Property="Background" Value="#e3e3e3" />
<Setter TargetName="border1" Property="BorderBrush" Value="#00395c" />
<Setter TargetName="border2" Property="BorderBrush" Value="#727272" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Background" Value="#c6c3c6" />
</Style>
</Button.Style>
</Button>

Buttons' background being flickering or disappearing on Mouse Over

I added a custom style on Mouse Over effect for the button in Resource Dictionary inside the App.xaml file. While on my computer, it is working perfectly but on some PC the button's background is flickering or disappearing on mouseover.
App.xaml Code
<ResourceDictionary>
<Style x:Key="btn-danger" TargetType="{x:Type Button}">
<Setter Property="Background" Value="#d84315" />
<Setter Property="Foreground" Value="White" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" Cursor="Hand">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#d9534f" />
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
</ResourceDictionary>
How is it being used
<Button Style="{StaticResource btn-danger}" Margin="5" Click="Ok_Button_Click" Height="29" Width="100" Content="{Binding Path=Ok, Source={StaticResource Resources}}"/>

It is necessary to put the trigger under the template property, to border background be changed properly. Try to change the style definition as below:
<ResourceDictionary>
<Style x:Key="btn-danger" TargetType="{x:Type Button}">
<Setter Property="Background" Value="Gray" />
<Setter Property="Foreground" Value="White" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" Cursor="Hand">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#d9534f" />
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>

TextBox SelectionStart is always 0 with custom style

I have a TextBox input field with a custom style:
<TextBox Style="{StaticResource SettingsTextBoxHint}" KeyDown="textBoxInput_KeyDown" PreviewKeyDown="textBoxInput_PreviewKeyDown" Name="TextBoxInput" Text="{Binding TextBoxInput, Mode=TwoWay}" Tag="{lex:LocText TypeAMessageHere}" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap" FontSize="14" HorizontalAlignment="Stretch" VerticalAlignment="Center" VerticalContentAlignment="Center" BorderThickness="0" Margin="0,0,33,0"/>
To which I added the custom style:
<Style TargetType="{x:Type TextBox}" x:Key="SettingsTextBoxHint" BasedOn="{StaticResource {x:Type TextBox}}">
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Border x:Name="Border"
BorderThickness="{TemplateBinding BorderThickness}"
Background="White"
Padding="1,2,5,2"
BorderBrush="{StaticResource PrimaryColor}"
ToolTip="{TemplateBinding ToolTip}">
<Grid>
<TextBox Text="{Binding Path=Text,
RelativeSource={RelativeSource TemplatedParent},
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}"
x:Name="textSource"
Background="Transparent"
BorderBrush="Transparent"
TextWrapping="{TemplateBinding TextWrapping}"
Panel.ZIndex="2"
FontSize="12">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Border x:Name="Border"
Background="Transparent"
BorderBrush="Transparent"
CornerRadius="0">
<ScrollViewer x:Name="PART_ContentHost" VerticalAlignment="Center" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TextBox.Style>
</TextBox>
<TextBox Margin="0,3,0,0" BorderThickness="0" Text="{TemplateBinding Tag}" Background="{TemplateBinding Background}" Panel.ZIndex="1">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="FontFamily" Value="{StaticResource RobotoRegularFont}" />
<Setter Property="Foreground" Value="Transparent"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Text, Source={x:Reference textSource}}" Value="">
<Setter Property="Foreground" Value="#cccccc"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="Border" Property="BorderBrush" Value="DarkGray"/>
</Trigger>
<Trigger Property="IsFocused" Value="True">
<Setter TargetName="textSource" Property="FocusManager.FocusedElement" Value="{Binding ElementName=textSource}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The point of which is to make the TextBox transparent and to add hint functionality which text is set trough Tag.
Everything works exactly as I want. The problem I have is that I am writing a new functionality in which I need the position of cursor in the TextBox. But SelectionStart or CaretIndex always return 0 value. If I remove my style I get the correct value.
Can anyone tell me what I missed?

The problem is that you are using a TextBox within a TextBox. The user interacts with the inner text box, whose text, caret position, etc. are in no way related to the outer text box.
Let me clean up your style for you:
<Style x:Key="SettingsTextBoxHint"
TargetType="{x:Type TextBox}"
BasedOn="{StaticResource {x:Type TextBox}}">
<Setter Property="BorderBrush"
Value="{StaticResource PrimaryColor}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Border x:Name="Border"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
Padding="{TemplateBinding Padding}">
<Grid>
<ScrollViewer x:Name="PART_ContentHost" VerticalAlignment="Center" />
<TextBlock x:Name="Hint"
Margin="3,1"
Text="{TemplateBinding Tag}"
FontStyle="Italic"
Foreground="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"
Visibility="Hidden" />
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border"
Property="Background"
Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
<Trigger Property="Text" Value="">
<Setter TargetName="Hint" Property="Visibility" Value="Visible"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
To find the cursor position within the TextBox, you can use Mouse.GetPosition(your_text_box). To get the caret position within the text, use the CaretIndex property. Note, however, that CaretIndex is *not* a dependency property, so it does not raise change notifications. Thus, you cannot bind to it and expect the binding target to be updated.

Change the Button contents in XAML on trigger

I'm trying to make a template that will change a Button's background as well as the color of it's TextBlock. I tried the following XAML in my template, but it just makes the button dissapear on mouseover. Is there any way to change the properties of a buttons contents on triggers?
<ControlTemplate TargetType="{x:Type Button}">
<Border
x:Name="Border"
CornerRadius="0"
BorderThickness="0"
Background="{x:Null}"
BorderBrush="#FF404040" />
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="White" />
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate DataType="TextBlock">
<TextBlock Foreground="Blue" />
</DataTemplate>
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>

Style:
<Style TargetType="{x:Type Button}" x:Key="MyButton">
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="Border"
CornerRadius="0"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
TextBlock.Foreground="{TemplateBinding Foreground}"
BorderBrush="#FF404040">
<ContentPresenter Margin="2"
HorizontalAlignment="Center"
VerticalAlignment="Center"
RecognizesAccessKey="True" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="White" />
<Setter TargetName="Border" Property="TextBlock.Foreground" Value="Blue" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Usage:
<Button Width="100" Height="50" Content="Lalala" Style="{StaticResource MyButton}" Background="Brown" Foreground="Green" BorderThickness="2"></Button>
You're missing the ContentPresenter, responsible for visualizing the Content property of the Button.
To set the foreground you can use TextBlock.Foreground attached property.
Control Styles and Templates has always been very usefull to me :)