That looks a like a lightmap UV problem. Post a screenshot of the uv layout inside the mesh editor (of a problematic mesh).
Also post a screenshot with lightmass settings. Settings> world settings > lightmass.
That looks a like a lightmap UV problem. Post a screenshot of the uv layout inside the mesh editor (of a problematic mesh).
Also post a screenshot with lightmass settings. Settings> world settings > lightmass.