I'm working on this project from Max and Importing stuff into UDK and along the way I don't know why for one of my mesh UDK translate the UV maps very messed up for my Island/grass top.
In my max file the Islands doesn't have messed up UV map, and 2nd UV map(Light map)
this is the regular uvmap for texture
this is 2nd uvmap/lightmap for the mesh also from Max file. there are no inverted faces, nor overlapping.
this is how udk reads the map for 1st uv map.
2nd uvmap channel
this is what happens when after I build lights, and scene.