Please consider going through Wix Support about this issue since then it is easier to take a deeper look and troubleshoot the functionality and layout:
I don’t think this is something that needs to be handled on a one-off basis by Wix Support. This is a fundamental problem with the design of the Wix copy-to-clipboard popup.
Even if it really needs to be a popup, where text comes out of an input box, then clicking the “Copy” button should immediately close the popup. But it doesn’t. Instead, the screen zooms in on the input box (at least on iPhones), which puts the “X” button out of sight. Sure, a savvy user can figure out what to do, but it’s really clunky and misleading… and takes WAY too many clicks!
On my desktop site, it’s a single click, and I added a little “copied” indicator that gently fades away. Simple and clean.
But on mobile, it’s a complicated, multi-step process that requires two clicks, scrolling to find an off-screen elements that the user likely wouldn’t have even noticed yet, and then a third click if they managed to get that far. It’s horrible.