Apologies for the late response.
Is this while testing on a desktop browser or on the mobile device?
I recall such a problem in IE, which in any case is not recommended for mobile application development/testing (Chrome/Safari are recommended as they share the webkit engine, which is also used in iOS/Android).
In the long run we are considering dropping the Dual Display, and opting instead for a parent Pane containing 2 child Panes where a click switches visibility of the 2 children (setting <Visible> of the 2 as needed).
For best results, use the Firefox browser..