Listen, this is the problem with people. You KNOW it is ossibly manipulated. GET OVER IT! It shouldn't hurt you if you are in this game to make money. While you and others cry "why is it down?" or "can you see the manipulation?", I am buying more shares and averaging down even more.
If you can't, then fine, that is your issue and possibly something to learn in the future; grow into the stocks gradually like I and the great Phillip Fisher did. Also Warren Buffett uses the same strategy. Because you never know why a stock falls or goes up the way it does.
Secondly, this float was tiny before the buyback; it is now 8M less at 31M shares outstadning. So any signifcant buy or sell WILL move this stock. It is why companies with little outstadning shares SPLIT their stocks as they get more value, to try and decrease volatility by creating more shares so each move is not as significant. But DECK does not have that opurtunity right now.