You might have Switched ON OVERLAY indicator in your Screen.
As, You are using another Record format for Window, You will not need OVERLAY indicator for displaying Window when ‘?’ has taken from your initial Screen.
OVERLAY indicator is needed only when you will need to display and aceess the Screen & Window at a time.
If you need the OVERLAY indicator in your screen for any other purpose, try switching it OFF when you are displaying WINDOW.
Reply back, If it doesnt work.