bug.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ViewScalingTranslatingTests.MainPage">

    <ContentPage.Resources>
        <ResourceDictionary>
            <Style TargetType="Button">
                <Setter Property="HorizontalOptions" Value="Start" />
                <Setter Property="WidthRequest" Value="100" />
                <Setter Property="BackgroundColor" Value="Gray" />
                <Setter Property="FontSize" Value="12" />
                <Setter Property="HeightRequest" Value="32" />
                <Setter Property="Padding" Value="0" />
            </Style>
            <Style TargetType="BoxView">
                <Setter Property="VerticalOptions" Value="Fill" />
                <Setter Property="HorizontalOptions" Value="Start" />
                <Setter Property="WidthRequest" Value="1" />
                <Setter Property="Color" Value="LightGray" />
            </Style>
            <Style TargetType="Label">
                <Setter Property="HorizontalOptions" Value="Start" />
            </Style>
        </ResourceDictionary>
    </ContentPage.Resources>
    <Grid>

        <BoxView Margin="0,0,0,0" />
        <BoxView Margin="50,0,0,0" />
        <BoxView Margin="100,0,0,0" Color="Black" />
        <BoxView Margin="150,0,0,0" />
        <BoxView Margin="200,0,0,0" Color="Black" />
        <BoxView Margin="250,0,0,0" />
        <BoxView Margin="300,0,0,0" Color="Black" />
        <BoxView Margin="350,0,0,0" />

        <Grid>
            <Label Text="0" />
            <Label Text="50" Margin="50,0,0,0" />
            <Label Text="100" Margin="100,0,0,0" />
            <Label Text="150" Margin="150,0,0,0" />
            <Label Text="200" Margin="200,0,0,0" />
            <Label Text="250" Margin="250,0,0,0" />
            <Label Text="300" Margin="300,0,0,0" />
            <Label Text="350" Margin="350,0,0,0" />
        </Grid>

        <ScrollView>
            <Grid>

                <StackLayout Margin="0,30" Spacing="30">
                    <StackLayout>
                        <Label />

                        <BoxView Color="Red" Margin="0,0,0,0" WidthRequest="100" HeightRequest="32" />
                        <BoxView Color="Red" Margin="-50,0,0,0" WidthRequest="200" HeightRequest="32" />
                        <BoxView Color="Red" Margin="0,0,0,0" WidthRequest="200" HeightRequest="32" />

                        <Label />

                        <BoxView Color="Red" Margin="200,0,0,0" WidthRequest="100" HeightRequest="32" />
                        <BoxView Color="Red" Margin="150,0,0,0" WidthRequest="200" HeightRequest="32" />
                        <BoxView Color="Red" Margin="200,0,0,0" WidthRequest="200" HeightRequest="32" />
                    </StackLayout>
                </StackLayout>

                <StackLayout Margin="0,30" Spacing="30">
                    <StackLayout>
                        <Label Text="simple scale" HorizontalOptions="Center" BackgroundColor="#AAFFFFFF" />

                        <Button Text="default"   ScaleX="1" TranslationX="0" />
                        <Button Text="scale 2x"   ScaleX="2" TranslationX="0" />
                        <Button Text="left scale 2x"     ScaleX="2" TranslationX="0" AnchorX="0" />

                        <Label Text="Scale then translate to 200" HorizontalOptions="Center" BackgroundColor="#AAFFFFFF" />

                        <Button Text="default" ScaleX="1" TranslationX="200" />
                        <Button Text="scale 2x" ScaleX="2" TranslationX="200" />
                        <Button Text="left scale 2x"   ScaleX="2" TranslationX="200" AnchorX="0" />
                    </StackLayout>
                </StackLayout>

            </Grid>
        </ScrollView>

    </Grid>
</ContentPage>