This answer, which I posted 2012–12–11 21:27:14Z, got accepted and unaccepted within the following 26 hours. The following screen shots were taken 2012–12–12, approximately 16:40Z and 22:40Z:
and my reputation dropped 15 points in that interval. But my Reputation history display doesn’t show either the accept or the unaccept:
Is this normal?