I recently recently fixed a bug that incorrectly caused commas to become underscores in author names. As a result when new books with the same author are added, a new folder is created. Those folders are not duplicates, they will have different files inside them. You could merge them manually by renaming the author inside calibre to something else for the old books and then back to the correct name, but it's not worth the effort, just leave them be.
Last edited by kovidgoyal; 01-22-2012 at 12:26 PM.
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