Encounters falling through floor/above roof

mynameisdan

I am having an issue with my encounters falling through the floor in the Cave environment. Even with a completely unpopulated room, when I go to test, my encounters are nowhere to be found, and because I can't view anything with a 3D view, I can't determine if the Z axis needs to be raised on my encounters until it's tested, and even then, in the Open Cave room, my encounters are still falling through the floor.