I read on the help page
Should I be concerned about reversal statements on my profile?
No, not at all. It's only an indication of reputation change. After all, we can't control the actions of other users. It's very rare where we'd run across a user who was committing the voting fraud themselves on their own account, and in most instances of that, they will have already been dealt with accordingly. You should in no way be concerned with reversal statements in your reputation history.
Actually NO reputation has been lost, so the figure shown for the current day is blatantly wrong. Here is a screen shot for the last days (and the serial upvoting has surely happened between the shown dates)
My current reputation for the day is 210, not the absurdly ridicolous 70 that's shown.
So there are two cases: either the figures shown for the preceding days are wrong or there's a bug that seems to allow me getting over rep cap for the current day.