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Did you directly copy the book from the Calibre library on disk, rather than exporting it from within the Calibre program? If you make metadata changes within Calibre, they will be applied to the book whenever you export it from the program: "send to device", "save to disk" or (for those devices which support it) "send by e-mail".
Don't take files directly from the Calibre library on disk. Regard it as a "black box". Don't go in there.
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