Copy/paste group.

Hi. I have a design across multiple pages. Say, I want to copy group buttons made from multiple rectangles and text on top of those rectangles from Page1 to Page2, but sometimes only text get copied if lucky. For some reason group cannot be copied. I am 100% sure this was possible before, because that is how I done my design about half a year back. Now I would like to amend it, but doesn’t work. Thank you.