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Interesting - you are saying the Author field is actually blank, rather than containing "Unknown"? Does it get changed to "Unknown" when you copy to the other library?
I thought every book had to have an author, and calibre will always change it to "Unknown" if it is not specified. Perhaps Kovid may know the answer to this one - are you by any chance a long term user of calibre, and this book might have been imported with a very old version before this behaviour got "fixed" into its current implementation?
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