Beehaw recently updated to 0.19.11, which was the change within the last few weeks. Your account is marked as being a bot, and bots accounts aren't allowed to vote as of sometime between Lemmy 0.19.0 and 0.19.11 (Beehaw upgraded from 0.18.4 to 0.19.11).
So unless there's a reason your account needs to be marked as a bot account, you should be able to just go into your profile and uncheck that box.