Specifically FAO Tim Post I guess, but this is probably going to relate to any StackExchange account that has previously been deleted and then put back together by the kind people at StackExchange.
I appear to be the victim of an issue which has given me the acceptance bonus for all questions that I asked which I then subsequently self answered. Examples of some of these questions are as follows;
In both of the above instances, I have already unaccepted and re-accepted my answer, which subtracted -15 reputation as an "unaccepted" entry in my reputation list, and then added +0 for the new accept, which is the way the system is supposed to work.
Since I have a reasonable number of self-answered content, there will be more. By my reckoning it's about ~1k reputation (based on the reputation I had before I left, subtracting the reputation I've lost due to post edits and low-reputation tag wiki submissions not being re-associated with my account). Obviously I'd rather not lose it ;) - but in the interest of not gaming the system I figured it needs reporting and correcting.
The two above questions and the reputation changes caused by unaccepting and reaccepting the questions can be seen on my reputation list for the 22nd and 23rd of September 2013.