Problem creating location

Trying to import a height map made in world machine using tutorial from gaijin and examples seen on you tube. I can successfully import the map it has my extents area visible, CDK ignores all height values… areas that should be massive island are basically small shadowy shapes on the floor. I tried all valid file types, made no difference.

Honestly the height map looks good to me when I view it in other software and have successfully imported and viewed model in 3DS Max without any issues.

Any ideas?