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When I connect a device, Calibre will show 2 books if from the same entry as shown here in the screenshot.
But if you should have duplicate books within Calibre, where there's actually 2 entries in Calibre even though the title is the same, it won't show the "2 books" notation. But different software just might see those dupe entries differently to come up with different totals.
Purchasing a book more than once used to happen to me often, until I cleaned up Calibre and make it a point to always check before making a purchase.
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