This is more of a curiosity. I'm not actually concerned.
Yesterday I was a bit confused. I logged in to notice that I had hit my cap for the day. I hadn't posted anything that I would have seen as tremendously insightful, so I checked the rep history and it almost seemed as though someone went through my history and voted up a bunch of my answers.
I asked around, and as it turns out, a colleague of mine who is a relatively frequent SO user, but is new to P.SE decided to check out the site and reviewed my answer history - specifically my highly voted answers. He was "impressed" (which I am actually quite pleased about, because I have a great deal of respect for him and his abilities) and voted for a number of my answers quickly causing me to hit cap.
About an hour or so ago, it appears that all those reputation gains were removed. Is this expected behaviour? Is there an automated system in place that identifies these types of conditions and reverts them or is something else at play?
For the answers that were voted up, I think honestly deserved the recognition for (via reputation), but I'm not going to put up a stink about it if some rule has been broken. Again, this is more of a curiosity and if this situation is an acceptable aberration then I wouldn't mind if it was restored.