For at least the past week or so, every time that I go to close a question in the iOS/iphone/related tags, it ALWAYS includes this question as the top candidate for closing: How to check for an active Internet connection on iOS or OSX?.
For instance, I voted to close this question: How to parse the string "2013-06-13T05:47:03.737Z" to NSDate object as a duplicate (which has absolutely nothing to do with the referenced question) and it showed up again, right at the top.
I'm guessing that it is picking it up just from the tags (the question that it is returning is one of the most highly upvoted questions in the tag), but there should be at least some matching content in the title or question itself before it suggests another question as a duplicate.