I have a Nook and love the Calibre software! But, somehow I have several epub documents that I've uploaded that have duplicates. I've tried removing the books with the duplicates (both copies), closing out of Calibre, and then restarting my computer, but as soon as I add the book back into the library, Calibre shows "Main (2 books...) under On Device.
How can I get rid of these duplicates copies once and for all? Out of 220 books, there are 5 that have duplicates. Any help will be greatly appreciated.