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@carlberger - it might be an idea to run Library Maintenance->Check Library
The second phase includes the comparison of what formats are in the book folders (according to your computer's file management software) versus what the calibre has recorded in its database as being there. It might give a clue as to why that formats column is spurious.
They can get out of synch if you add/delete/rename files in book folders other than via calibre - if you stick with calibre to do those things then you should not get any problems of that nature.
BR
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