Dayne - no I haven't talked to the people at GMAT yet. I wanted to find proof before I called them. There's a very good chance that I misremembered my scores, but I'm sooooo certain that I had a 690, I'm positive of it.
Taylor - I agree. I don't think anyone's screwing me over or anything. My first reaction to seeing my scores was, "Whoa, they must have adjusted my scores down because people are doing better on the GMAT now. After all, it does say that my score is calculated on a three year average of test takers."
I just posted on here because I wanted to know if it was common for scores to be adjusted around years after taking the test. I'll dig in to this and let you guys know what I find out. I probably just misremembered it or something, but it's so weird, I've never been more sure that I got a 690 - weird.