well how do you have it set up? are you using c_move? do you have USE_BOX set with a FAT or NARROW haul? I guess i don't really have enough information to help you. It appears from your drawing that the majority of you players body is going through a wall which means that your collisions box must be smaller then the player. did you use c_updatehull?

Here is a link to Game Studios Collision Engine details. http://www.conitec.net/beta/collision.htm