Look at this user's reputation points tab.
There are infinite +15s for accepted answer and infinite -45s as voting reversed.
It doesn't say which question's answer was accepted.
Is this a bug?
Here is the link to screen shot.
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This was caused by a user who has abused the system (quite unnecessarily) by accepting and unnaccepting answers for specific people. He has been suspended for 30 days now.
The people who have lost rep will get it back when the recalc happens.