This question was (rightly) closed as an exact duplicate: https://math.stackexchange.com/questions/1717381. (If I'm not mistaken, only moderators can do that.) The message at the top differs from the normal duplicate message and says "This question is an exact duplicate of:" without claiming that the referenced question has an answer. But the message at the bottom is the normal one and says "This question has been asked before and already has an answer.", even though presently the other question (Three fake rocks) doesn't actually have an answer.
Related (but as far as I can tell not duplicate) questions: