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@theducks, if the AZW3 is the output of a conversion it would have the current metadata from the database.
@flexy123 - the metadata you see in the calibre book manager is from the library (sqlite) database - metadata.db. The metadata.opf files in the book folders are there to be used by the Restore database tool in the event that the database becomes corrupt or lost.
The metadata.opf files are maintained via a low priority background write process. In the case of mass updates to large libraries rewriting the files can take a long time to complete. You can force completion (e.g before doing nightly backups) via the calibredb --backup_metadata command.
BR
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