Looks like someone abused the comment system and probably used bots to downvote multiple times on a bunch of positive comments and upvote multiple times on negative comments. Right now, I have disabled the voting system because someone abused it.
I looked into it. I don't see any option to check if something is a bot in itch.io or not. The person could also use multiple verified accounts to bypass the check. There isn't much i can do except turn off the comment ratings. This may be temporary.