Your camera has in-body image stabilization; the sensor is on a floating magnetic chassis. It is completely normal.
I have been using the pentax kr for couple of days,and I like it so far,good picture quality,fast(6fps),great in low light .I have notice a"klunk" sound when I move the camera side to side like something is moving or loose inside, not sure what's that.I tested a canon t3, pentax 5100 and those cameras dont do that.Any ideas?. I'm new with dslr ,any help will be appreciated

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic