When you make changes to the library on some models of the Sony, including that one, it re-indexes the library which can take some time. How long did you leave it? If literally hours, then something else is wrong, but otherwise it might be worth leaving it on for a bit and see if it sorts itself out.
I don't have a Sony myself but I'm sure someone more knowledgeable will be along in a minute. Welcome to MobileRead!
Graham
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