Indesign doesn't update master and parent pages
I'm suddenly having trouble with the master pages after that annoying name change.
When I created most of the documents in the book, I created two master page spreads, but later attempted to update them from a newly created file and ended up with the mess you see in the screenshot below after synching the book. Instead of updating the A-Master and B-Master, it added Parent page spreads, so now I have 4 pair of master pages and still have to manually update the master pages for each document in my book. I really don't relish the idea of having to recreate all of the documents in the book to fix this issue.
Ideas?
I'm using InDesign version 17.3 on a Mac running the Monterey OS 12.2, if that makes a difference. And no, haven't updated CS for a while. Would that help or make things worse?

