I also noticed the exact same thing this morning, having had a sudden jump from 13 or so votes to 21 votes overnight, whilst having a total of 2 views and 1 download the last few days. Since I am fairly certain I know who that download is because he left a comment, I am also fairly certain that those votes were given by someone else who did not download the game.
Hopefully those votes will be void anyway, as it should not be difficult to filter away votes from people who have not even downloaded the game, although the only one's who knows for certain are the organizers.
It would be nice if they could simply filter those fake votes away ASAP though, as even if they were to not count towards the final score they remove the entry from the "Games in need of ratings" tab. Personally that is the most annoying part in my opinion, as it reduces the amount of verbal feedback I get from people who actually play the game that I can use to improve it.