Some sides of an asset are not being effected by static lights and turn black.

Some walls don’t get lit by static lighting and only get effected by static skylight and movable lights. Everything is static and they’re are all a single mesh, UVs and lightmaps looks good and texture resolution is fine. Only the walls that are facing the same direction are effected. There are no light leaks either. I tried unwrapping by hand or reimporting but nothing seems to fix it. Any ideas on what might be causing this issue?

Thanks!