In the first post, he said the lighting problem was solved by moving the map so the origin was not in the ground, but that resulted in the skybox being out of place. I was trying to help with the latter problem. If the lighting problem goes away when the origin is moved, and if my suggestion helps with the resulting skybox problem, then the map would be fixed.
I don't know how to fix the lighting problem, other than moving the origin like he did before starting this thread, but I am trying to help in what little way I can.