Lachlan McKillop

Hello Im looking for help I have made many 3d models in 3ds max I export them as either 3ds or obj into blender or ac3d then export out of these two into a xplane format when I do this if I manage to get the texture file to follow I lose polys as you can see in the attachments. if the texture fails to load I dont lose polys. can some one tell me what is going on here? the left is in game and broken the right is in 3ds max and fine (the texture is just a test run)