In all versions of RW7, there is a bug when duplicating a stack, or elements of a stack.
Using the Foundation theme, I have a Tabs page with two color variations of a Christmas art print. I created the elements for the first tab, which consisted of a main page image, and then a modal with details for the print. I copied the stack for the second tab. I substituted a blue image for the pink one, on both the main page and the modal page. In Preview and online, the blue image “took” for the main page, but stubbornly refuses to change for the modal.
I have reported this problem before, and I am reporting it again. According to Joe Workman, it is definitely a bug. Hopefully, my persistence will result in someone, somewhere, addressing this problem.
This is the file: https://app.box.com/s/1ig9kf0qkwyygnax8h240miv2tzgj5iy
Attached is the image of the WRONG pink print being displayed on the blue page modal.