The audit was the accepted answer. You flagged that answer, and, of course, if it had been the real deal that would have been quite wrong.
How can this be? Well, audits will deliberately fake post details so you can't tell if a post has been accepted or upvoted, or who wrote it, in order to avoid making audits absolutely trivial: you have to look at the contents. But this means that naive attempts to suss out duplicate answers will get you in trouble.
But all is not lost: if you pay attention to where you land on the page when you click the link to the right of the answer in review, you can always tell. The link given will always scroll you to that particular post; if it leaves you at the top of the page, you know it's been deleted, and if it takes you to an upvoted answer unexpectedly, you know that that's the real deal and that the review is an audit.