High ranked mod/troll types, who seem to spend all day there trying to get more karma for some reason, constantly cruise for new questions. They dont know much about programming in general, and have zero knowledge of my specialist field for example. If they see a question that superficialy resembles or shares certain keywords with another one they will close it as being answered already (pretty much acting like particularly dumb bots) even if it has nothing to do with the existing question, or if the existing question is massively out of date and irrelevant because of updates to the software in question.