I was looking at this snippet by Ancient Dragon and I saw that it had received 7 downvotes. I found this odd, because the snippet was actually quite good, so I upvoted it. I expected to be -6 after my upvote, but it went from -7 to +1. This is strange.
So I went to AD's profile and searched for negative posts made by AD. I choose a random one which also had -7 and upvoted it and the same thing happened: it went from -7 to +1. Could this possibly have something to do with the voting-script-abuser from a month back?