Ok so after I painted my room and started to move my desk and computers and stuff to make it so I can record my youtube videos. I notice something wired in the room where I moved everything into. Right by the door it feels like it sunk in not the best way to describe it but its sitting lower then the rest of the upstairs. It makes a crack sound to but it has been doing that for a couple of year I did not pay attention to it as I thought it was just getting old my house is 20 years old to. Anyone know why this is happening. please post A.S.A.P!!!