I have a couple of Models here, but there's only one, which will always draw in front of the others.
I tried to replace the asset-source to an other model and then the order is correct, but on this particular one, it won't render behind the other model like it should.
See the problem here (Problematic model is the dark mountain)
http://s1.postimg.org/d92ku9mvh/image.png
Why is that happening?