There are other options. Probably has to do with water height then?
Try adjusting 'window'>'water'>'height'>'-20'
Once water height is -20, you will have to go to object menu>f2>select entire map>page up until water height looks normal.
Now all of your models will be underground. Select Object Group Edit, select entire map, page up until models are level with the ground again. I could be wrong, but I know -20 is necessary height for custom maps... Didn't think that applied when editing existing official maps.
If this doesn't solve your issue, please PM your map or a screenshots of what you did and I will edit it and send you a copy myself once I get it working.
Hope this helps,
~Azura Skyy
sir, how to "select entire map" ? . anyway, i've sent you the map in PM.
thanks