I had the same issue with the mixed up author names in the tag browser as well. The author_sort values and authors values were all correct (and sorted correctly in the
Manage Authors screen), but were consistently mixed up in the tag browser. I just figured it out, and you may be having the same issue.
Check under the tag browser, and make sure that the first pulldown menu is set to "sort by author". Mine was set to "sort by average rating" and was causing the authors to sort randomly by name.
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