On the storygame rating page, it tells me this:
"October, the last time you rated this game, you gave it 6 - it's worth every cent. Feel free to change your mind or give it the same rating. Only your latest rating is counted."
So the system appears to have taken in my most recent rating (as the comment screen tells me I've rated it a 6), but the storygame page tells me I've rated it a 5.