Collision mesh scaled during rotation?

I have a random rotation set for some rocks when they are created so that they dont all look the same but they collision mesh becomes huge and you can walk on it into the sky which is obviously a problem, if anyone knows how to fix this please tell me, here is the rotation.

%rotr = getRandom(1,360)@" "@getRandom(1,360)@" "@getRandom(1,360)@" "@getRandom(1,2);

Thanks.