On sites that are not Stack Overflow, two users are required to reject/accept a suggested edit. Until there aren't two users who give the same response, the suggested edit will be kept in the review queue.
This is what happened for this suggested edit, which was first rejected from a user, and then approved from two users.
On Stack Overflow, where three users are required for a suggested edit to be accepted/rejected, you can have situations like this one.
Also in this case, the suggested edit is still shown in the review page until three users don't select the same response.
As Daniel Fischer said, the vote of the post's author, as well as a moderator's vote are binding. That happens even when there aren't votes from other reviewers: A moderator, or the post's author can approve a suggested edit alone.