I have a bot setup to counter ranchorelaxo's random voting (not my idea, but many people asked me to do so).
But I didn't write the bot, and it could use some improvement. So sometimes it overvotes, as it doesn't properly account for changes in voting power I think.
Generally speaking, in such cases I go back and manually adjust the downvote. In this case, since I liked your post, I've just removed it entirely.