Gaea to Unreal heightmap issue in Landscape

Hello all,

I have a problem with Gaea when I export my heightmap (png 16bit) I tried using a auto-level & gamma & ignore vertical scale too, but when I import the heightmap into unreal my mountine gets chopped off. (see image) Does anybody know how to fix this? I also tried a old Worldmachine heightmap and its more grayscale and this works fine.