Maya Model Mesh Collider Problem

I have a simple cube model I made in Maya (I know there are Cube primitives, this is just a test for a pyramid shaped model) and it does not work correctly when I set it to trigger. I have a ridgid body attached to it, and it works fine as a trigger when it s not a convex collider but it registers exit trigger when an object leaves a face of the maya model, but when I make it convex it triggers enter correctly, but the exit does not trigger until the model is past an object and it is past an object by half of the Maya models width. Any ideas why it does this?