I may be off base here but everyone seems to be "assuming" that he has saved into his Calibre folder structure. All he says in his original post is "My Calibre ebooks files", which could well mean the files either on his device or as a result of a save to disk operation elsewhere. I think they may have a problem with their save to disk template with a duplication of {author_sort}\{author_sort}\ or similar...
Just my 2p...
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