lightmass problem!!!!!!!!!!!!!!!!!!

hi guys! i built a level with high lightmass setting,but the shadow somewhere appear very strange.
so how can i fix that problem shows below…



There could be a number of issues. What are your light map resolutions? Are you stretching static meshes (which will also stretch the lightmap)? Are you building with production lighting, or preview (or between)?

Also, make sure that meshes aren’t extending beyond each other or you will get bleeding.