Looks like you might have 4 books that overlap the ID of other books in the library
This is one of those times that you CAREFULLY go under the skirts:
Find those folders with the EXACT name and NUMBER .
Just the (title) folders
eg The Art Forger_ A Novel (492)
Move ALL of them Completely Out of the Library
Run the Maintenance check and correct (usually mark for deletion of empty authors)
Now add those books in the traditional manner (if they don't already exist. ie are duplicates)
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