Possible BUG: unable to duplicate radio buttons in Pro 9

I'm creating an application form where each response is entered on the appropriate page(s) in the forms that follow. Many of the same answers get repeated: eg company name, telephone number etc which makes this feature very useful.

From my testing, text and tick boxes duplicate correctly. BUT I can't get radio buttons to duplicate.

(for those not aware of this, Acrobat automatically creates unique names for each field that is duplicated that are linked back to the 'control' field.)

Does anyone have an idea how to do this? This is my first post here. Does Adobe monitor this forum? How do I go about reporting this 'BUG' if it indeed is a bug and not just my failure to understand the minimalist documentation of this feature.

Thanx!