Thanks for the idea. I checked the Nook and that is where the problem was. Just an FYI to anyone else who encounters this problem ... even though I deleted the dupes in Calibre and from the Nook folder on my computer, the dupes were still on the eReader itself. Once I deleted them on the Nook, they were gone. I have no idea how the dupes got there in the first place, but I at least now I know how to get rid of them if this ever happens again.
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