The ghost collisions run horizontally and vertically for where through to the ends of the map as in the sky and down below and all the way to the side ends of the world of the scene and it is so strange, to me it seems that it could not be an import. I checked my sky sphere and changed simple collision to complex, but of course it did not change anything. Then I deleted the landscape to see if that had anything to do with it and it did not affect the matter at all either. Then I tried duplicating everything into a new level and that did not work either. Same ghost collision still exists.