There seems to be a rendering issue with Indian locale.

Th following code snipppet demonstrates the problem, where the MinWidth=0 seems to be the culprit.

    <StackPanel Orientation="Vertical" BorderBrush="Black" BorderThickness="1" CornerRadius="12">
        <ToggleSwitch IsOn="True" FontWeight="Normal" FontSize="24" Width="Auto" MinWidth="0"/>
        <ToggleSwitch IsOn="True" FontWeight="Normal" FontSize="24" Width="Auto" />
    </StackPanel>

Here is the result