It sounds as if the regex you have set does not match the naming standard you adopted?
As a very simple example, the default that Calibre expects for Author is "Firstname Lastname" rather than "Lastname, Firstname". Not that this is catastrophic but it does tend to indicate the mismatch I mentioned.
There are several threads that discuss trying to work out the best regex for various naming patterns - perhaps one of these might be of use to you?
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