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Old 09-09-2019, 02:17 PM   #2
theducks
Well trained by Cats
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Posts: 23,782
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Join Date: Aug 2009
Location: The Central Coast of California
Device: K4NT, Galaxy Tab A, Kobo Aura2
Run Library Maintenance (Right click the Library icon)
Once that is done. formats:false should work

As to why?
That is what is called an 'Empty Book' . Many of us use that feature (add books: empty book: <qty>) to document: 1)paper versions (only) 2)wishlist

If yours was NOT that reason, then someone or something is:
1) going into the Library/Author folder and deleting the format
2)You have merged (copied) different libraries onto each other
3)You have the Library folder on a NAS or Share and or 2 users running calibre at the same time
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