Xbox 360 controller seems to be misbehaving

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No, it's an official controller since each and every 3rd party controller I've ever tried to buy either didn't work properly or died like a week in, usually both. And Xbox controllers don't have a mode button. The center button brings up a sorta game menu thing which is a little Xbox bar that is a separate thing from any game and can open on any window actually. If I remember rightly quickly followed by "Is THIS a game?" haha