Looks like you pissed off someone with bots based on people who disliked you.

There are two of the same usernames multiple times, one of them 6 times, one of them 7 times. Some of them on my instance as well, I have banned them now.

Edit: And this is not the first instance of it, that user including its other accounts has so far downvoted you over 350 times in total. That's some dedication.