This edit suggestion was approved although it was rejected by a user, and no other votes were cast.
According to suggested edits FAQ:
Three accept or reject votes are required to approve/reject an edit.
So, what caused this edit to be approved?
This is fixed now. We recently introduced a bug in which if the question asker with <2k reputation approved a suggested edit, then the "approve" review wasn't correctly recorded.
In other words, if it weren't for this bug, this suggested edit would show
We'll try to get the bad data cleaned up.