I've stumbled across what seems to be a (small) bug regarding the calculation of upvotes for specific tags. Sometimes (probably because of tag merging), a question will exhibit the same tag twice -- e.g., What's the difference between \newcommand and \newcommand*? is tagged with macros macros (one of these very likely was a newcommand before). Upvotes for answers to these questions will correctly be counted only once for the calculation of the "top users" (and potential tag badge earners) of this tag, but they will be counted twice in the tag upvote statistic of one's user profile. For example, compare the number of upvotes for macros top user Joseph Wright (186) with the macros upvotes on his user profile (214).
Ah, good point. I removed all the duplicate tags across the SE 2.0 network just now.
We should probably change tag renaming and merging so it doesn't create duplicate tags on posts.
It's not perfectly clear to me that it is exactly the same problem, but from meta.SO, Why are there questions with duplicate tags once in a while?, Jeff answers:
So the next time there's a duplicate tag problem, just flag one of them for moderator attention and we'll run the tag deduplicator page.
So if any moderators should happen to read this, ones who happen to know what the tag deduplicator page is, maybe they will know if it is the tool for the job or not.