Game Maker 1.4 - Collision Detection Not Accurate



I am using Game Maker 1.4. I am having troubles getting accurate collision detection with my obj_player and my obj_fire_hydrant. I am modifying the collision shapes to be only specific areas of both objects, but when I run the game, the parameters I set are ignored; it's as if the collision area takes the form of a giant rectangle encapsulating my obj_player and obj_fire_hydrant.

The room I am using is not a physics world; if I turn that on, my obj_player cannot move.

In the image below, I am holding the left key (obj_player should be running into obj_fire_hydrant), but they are not colliding in accordance to my collision shapes.