Strange line appears when Hover in ARM pc

Question

Hi there.

I created a UWP application with a command bar and I'm using it on an ARM computer.

There is a tiny diagonal line when hovering the icon and in other buttons happen the same error:

My code:

<StackPanel x:Name="grid">

<CommandBar HorizontalAlignment="Right">

<AppBarButton Icon="Like" Label="Like" />

<AppBarButton Icon="Dislike" Label="Dislike" />

<AppBarButton Icon="Favorite" Label="Favorite" />

<AppBarButton Icon="More" Label="More">

<AppBarButton.Flyout>

<MenuFlyout Placement="Bottom">

<MenuFlyoutItem Text="Option 1" />

<MenuFlyoutItem Text="Option 2" />

<MenuFlyoutItem Text="Option 3" />

<MenuFlyoutItem Text="Option 4" />

<MenuFlyoutItem Text="Option 5" />

</MenuFlyout>

</AppBarButton.Flyout>

</AppBarButton>

</CommandBar>

</StackPanel>