When I build the lighting for my map this happens to the grass on my landscape. Screenshot - b613adea3ed40ba85b58695a831892ba - Gyazo Any ideas?
Check for the material on your grass meshes. It is most probably set to unlit. It should be set to Default Lit.
EDIT: also, if its set to Default Lit make sure that there is nothing connected to the Emissive pin in the material.
I Figured it out by doing this. “Use landscape lightmap” for each grass in " GrassLandscapeType"