Hello Ben,

This is unexpected. May I ask you to open a new forum or support ticket where you can post some runnable code showing the issue? This way we can test it and see what is going on.

Regards,
Martin Ivanov
Technical Support Engineer

The RadRibbonView displays its content in a WPF Popup when in minimized state. The same way as the DropDownButton/SplitButton/ComboBox .. e.t. All of the popups in a WPF Application are controlled by the windows menu location settings. 
Ignoring these setting will be a breaking change to the clients which are used to display the RadRibbonView in its current state, that is why we can't consider this as a bug.

Once the feature is complete the users will have the control over whether they want to ignore the default windows settings or always display the popups  from right to left. 

Until this feature is complete you can ignore the windows settings using the following code(called after InitializeComponents):
public static void SetAlignment()
{
    var ifLeft = SystemParameters.MenuDropAlignment;
    if (ifLeft)
    {
        // change to false
        var t = typeof(SystemParameters);
        var field = t.GetField("_menuDropAlignment", BindingFlags.NonPublic | BindingFlags.Static);
        field.SetValue(null, false);
        ifLeft = SystemParameters.MenuDropAlignment;
    }
}