Yesterday, stats.SE showed I had a rep of 503. Today, it shows I have a rep of 501. The missing 2 points are not listed in my activity anywhere.
Furthermore, meta.stats.SE still indicates that I have a rep of 503.
What's going on?
Per the system message currently showing at the top of the page, we have performed a global recalc of everyone's reputation. As a result of the new changes, your rep will be in sync.
Check out your reputation history for October 1, 2011. You had a post that was deleted and the rep change came from that. This is now visible in your reputation report and going forward will be less confusing.