Nope, not switching editing tabs, I’ve disabled them.
This problem is only experience by a different user, I’ve tried logging into their account, which is listed as an admin, and I get the same problem. The editor just removes all ids whenever they try to edit page.
What’s happening for me is that it returns all of the posts in my category, not recognizing showposts. So if there were 20 posts in that category, it would show all of them.