I literally showed you a video and a screenshot of it. I proved it happens. Multiple devs on our team have experienced this multiple times, which is our threshold for reporting it. It's a confirmed bug. Likely related to the same memory issues that plague Pro on large sites that affects lots of other things. But again, I sent you a screenshot. Do you think I Photoshopped it? If not, then I've proven to you that the bug exists. It likely will not show up on a blank site with few elements. Pro's problems become apparent on larger sites with many elements.
Right now we have way too many issues in the Support queue with Pro and we cannot provide extensive bug squashing assistance, unfortunately. You guys will need to flesh out these bugs - or hire us so we can compensate for the time. We're just reporting them. And while you may not be able to reproduce the bug yourself, trust me. It's there. And you'll eventually fix it.
EDIT: Here's another video of the issue: https://co50.com/Themeco3.mkv
Very easy to reproduce on busy sites.