Curious! I'm looking at it and don't see a duplicate review in the "not recommended" section. I do see one trend which matches my experience with "not recommended" that I mentioned in another comment: 10 out of 13 reviewers have no connections on yelp. It seems like the account's social network is one heavy factor in deciding whether to recommend a review or not.

There is one curious review that shows up in the normal sort that looks like a "follow up" review despite both version of it being identical.