I too am getting weird results after changing the metadata in Calibre.
If I change author, and send it as a prc sometimes it works, sometimes it doesn't and sometimes "last, first" becomes "last and first". All my books are either mobi or prc. I just can't see a pattern as to what works and what doesn't.
I'm about to load ver 0.4.139 hoping that might fix it.
cheers
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