I recently learned that voting on lemmy is not anonymous. Anyone can get information about who has upvoted and downvoted a post or comment.
In combination with your IP, this is a massive privacy (maybe even physical security) risk. Also, people can target you for your votes.
Sadly, this is something where I would prefer Reddit over Lemmy. Big tech scrapes data from both places anyways, at least Reddit is safe.
They don’t seem very active, but you can try reaching your instance admin at https://lemmy.today/u/mrmanager
It is not the problem of my instance per se. It is a problem for all instances because everyone has to agree to instance terms but they kind of are agreeing to all instances’ terms.