[Note: I'm not concerned with actual reputation loss but rather intrigued by this use case]
Got the above. I believe it means that someone was on a upvoting spree, that was detected and reversed.
While I've heard about serial downvoting when multiple questions and/or answers got downvoted by the same user in a short period of time, the opposite is news to me.
What would be a likely motive for such action when no sock puppets are involved?