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There is no such thing as an "author sort" field in Kindle e-book formats, only an "author" field. Sorting by author always sorts by whatever is in the "author" field.
There is a special case in those devices that if the author field contains a comma it is assumed to be in "last, first" format and the parts on either side of the comma are reversed when displayed to the user.
When converting books to MOBI format in calibre there is an option in the "MOBI output" tab to "Use author sort for author". That should be used if you want author names to both display and sort properly on Kindle devices.
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