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CC's contract with you is that it will show the metadata (tags) defined in calibre as of the time CC's metadata for the book was last updated. This time is the later of when it was fetched from the content server, when it was sent over a wireless device connection, or the last connect as a wireless device where updating metadata completed successfully.
CC has no control over what Mantano does or does not do. Nor does CC use metadata stuffed into the book format, such as the OPF inside an epub. Whether or not a book's metadata is updated when it leaves calibre depends on a host of things, such as what format it is, how it is being sent, and whether it has DRM. This is the major reason that CC pays no attention at all to embedded metadata. There isn't much reason to believe that it is correct, where "correct" means equal to the metadata in calibre at the moment the book arrives on the device.
Note: fetching from dropbox will not update metadata inside a book.
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