Help with colliding objects

habsrule88

i am making a game and i need blocks to stack on top of each other sometime the are stacked sideways like "gravity is messed up" so i decided to just use the move behaviour. But when ever i stack them for a test and have one block at the bottom that is non movable then the blocks start to shake then they get really shaky and start going crazy, any ideas how to fix this????????

Thanks,