I just released a movie on my other account. I thought it was pretty good, and apparently, so did 200 other people; it passed judgment at 3.93.

I logged off and came back a half hour later. In that time, 37 more people voted, and the score dropped from 3.93 to 3.70.
WTF!

I haven't released a movie on the portal in a few months, maybe I missed something. Is this common? Why would I have a 3.93 average from 200 voters, then after the score is visible, 37 more people came in and dropped it by .23 points?

Either this is a fluke, just some bad luck, or there is something fundamentally wrong with the Newgrounds rating system...

Comments are appreciated.