That is normal. These things are fairly loose and rattle. I am not sure why, but it may be it is less likely to tip over if it has some flex? I reccomend using a plastic high lift stand. As far as positioning its a matter of having it very straight up and down, on a flat jack point and many times balanced.(example, if you want to jack both rear wheels at once, or work on a spring and go very high, the jack will have to be DEAD center or the truck will slide over. All this assumes aftermarket rock crawling/ wheeling style bumpers as its priety useless with stock bumpers. Remember safety too, these things are very shakey, and the handle can fly back up when letting the vehicle down.