[gm9]

Nice. I'm no expert on this, but the heightmin/heightmax don't look good, as far as I am aware the heightmin of the upper level must be identical to the heightmax of the lower level so you have a defined height at which the map changes. In your case between -5 and 10 both maps apply. Also I don't think you need the -99/99 values at all because you have no other map to change to at those levels, so just leave the values out.

PS: Thanks for posting the jpg images, we need them in full size though, not half size. Just telling you for the other maps you are working on, I already redid these here. As soon as you get the heightmin/max figured out I'll put them live.