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I had single books in the library that showed "2 books" in the "On Device" column. I searched everywhere (that I knew of) to find why this should be so but discovered no duplicate titles or books with different formats. Then I saw your post above and went to the arrow at the "Remove Book" icon.
There, and no where else, were the books shown in 2 different formats.
Ten books that were "mobi" on my Kindle were also listed as "prc". Two books that were "azw" on my Kindle were listed as "azw" twice.
The "mobi/prc problem might have been caused when I converted books from prc to mobi. I did that for some books and then deleted the prc format at "Edit Metadata" at Calibre.
I may have downloaded the duplicate "azw" twice for each book but I would have deleted the duplicates for the titles did not show up twice in the Library.
I am not proficient in Calibre, just discovered the site last week.
Hope this helps.
Don
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