As I understand Calibre, when you send the books to a device, the metadata is updated on the copy sent. Without changing the one on your computer.
Also, typically, with any conversion, Calibre keeps the original version. So if you select that book on the Book Details pane, you should see as format EPUB, ORIGINAL_EPUB. Showing that there are actually two versions, the original and the converted.
But, why do you want to keep only the "original" book? Metadata changes don't change the book itself.
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