Marvin looks for metadata in the EPUB file itself. I find that sometimes when I make changes to metadata in calibre (say, changing the cover), that change is reflected in calibre's database but not written in the EPUB. So Marvin never gets to see that metadata.
You can do an EPUB to EPUB conversion to make sure that the metadata is written in the book before sending it to Marvin.
Soon, Marvin will be getting a feature that will work around this issue in some cases.
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