Just by eyeballing the graph of the scores for my story, I had a feeling that something wasn't quite right. So I manually added up the scores and divided by the number of votes to get the average and guess what? My score is REALLY 7.4, not the 6.09 that the site claims I have!
Even stranger, my overall score when I had 29 votes was 6.11. When I jumped up to 30 votes, my score decreased to 6.09. This would have to mean that my latest vote was either a 6, or lower, for it to decrease the value. (The math suggests it is either a 5 or a 6).
The problem is that I remember the state of my score graph from when there was just 29 votes, and the amount of votes rating 6 or below hasn't changed! I had 1 vote for 4, 3 votes for 5, and 2 votes for 6 then; and I have 1 vote for 4, 3 votes for 5, and 2 votes for 6 now!
Clearly there would seem to be something off about the scoring system on this site.