There’s a fairly common pattern where someone says something that a small handful of folks downvote, then other folks come along and upvote the comment back to zero because they don’t feel it deserves to be negative, even though they would not have upvoted it otherwise. You’ve been posting a lot lately, so getting shifts of several dozen karma back and forth due to this kind of dynamic is not unheard of, though it’s certainly extreme.
There’s a fairly common pattern where someone says something that a small handful of folks downvote, then other folks come along and upvote the comment back to zero because they don’t feel it deserves to be negative, even though they would not have upvoted it otherwise. You’ve been posting a lot lately, so getting shifts of several dozen karma back and forth due to this kind of dynamic is not unheard of, though it’s certainly extreme.