The counter says that there are 0 pending edits while there is actually 1 pending edit according the title. It was this question. I could just open and review it. It's maybe related to the fact that this is the 2nd suggested edit by the same user.
Update as per Michael Mrozek's answer it turns out to be the amount of approvals on the edit: can't the title be little expanded? E.g. "This edit has n approvals" which would in turn make the
(0) part more sense (it initially didn't make sense to me).