I saw this today:
Note the two, identical apart from capitalization, "Possible duplicate" labels. I checked, and they point to exactly the same link. I realize that this follows the same sort of idea as this question (and I realize that that's kind of ironic) but I know for a fact this question was not re-opened, and even if it were, why the difference in capitalization and spacing?
Also, I can't be sure with that question, because the question in question has (questionably?) since been removed.
Sorry if this is some feature I just don't know about.