Books don't stay in Kindle Collection on Librarian Sync
I've got two books that will not stay in their collection & I'm baffled.
Background - Books 1 & 2 are by XYZ. I've got a collection that I've allocated them to in Calibre, called XYZ. They are the only two books in this collection, and when the problem started I hadn't read or opened either of them for a long time. When I run Kindle Collections in Calibre, the log report shows them in their proper collection.
Problem - When I go to my Kindle - Open KUAL - Librarian Sync - Update folders - any new books I've added are sorted into their proper places, but Books 1 & 2 aren't - they are "Floating" at the end of the list of collections in collections view. Collection XYZ is still there but now has no books in it. I can manually add 1&2 to it, and they'll stay there, but only till the next time I run Update folders; after that, they are back to floating again.
I've tried
1. deleting the collection in the Kindle & then recreating it. That works for the first time, then the books slip out of the collection again when I next Update;
2. reconverting the books, I've tried taking them out of Calibre entirely then re-adding as if they were new;
3. running disc checkers on the Kindle to check I've not got a bad sector or whatever.
This has occasionally happened in the past to a random book or so, but never with the persistence that 1&2 are showing!
Any thoughts? Thanks.
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