New reputation is too verbose: upvote/unupvote, upvote again
The latest reputation history tracking sometimes shows a sequence of accept-unaccept-accept as +30/-15, +60/-15, or whatever. When expanded, you see the three events happening during the same minute, so the data makes perfect sense.
However, the unaccept information is somewhat misleading: most likely, the users simply double-clicked the "check" mark, realized that only a single click is required, and promptly corrected themselves. It would be nice if the site waited for a few seconds before recording an accept or an unaccept, in the same way the hardware waits for a contact to stop bouncing before deciding that a key has indeed been pressed or released.
EDIT It looks like upvoting suffers from the same issue.