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Marvin gets the metadata from the ebook file, not from calibre's database. calibre does not write metadata to its own master copy of a book until/unless you do a conversion or use the Polish Book feature (shortcut key is "P") for EPUB/AZW3.
You can send the book from calibre with the Marvin XD device plugin, the usual way, since calibre always updates metadata on the copy it sends to devices or saves to disk, or use Polish Book to update the master copy synced to Dropbox.
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