I’ve seen lots of people had this issue, yet I don’t know how to solve it.
I have a level with some nice lighting, as you can see in the pic.
But after I build the lights, the lighting changes a lot!
I tried to change the lightmap resolution, but I couldn’t see any improvement, and there are no warnings when I build the lights! I can’t afford to use dynamic lights, so… I don’t know what to do.
So… any help will be highly welcome!! 
This is definitely a lightmap issue. Make sure that your meshes are properly UVed for lightmaps, and lightmap density is consistent throughout the scene.
The UVs were fine, but the lightmap resolution was a bit low (it appeared in a light blue in the editor), so that might be the issue here.
Also, I forgot that I had all the lights in Static, and after changing them to Stationary, everything went right. I think I’m gonna use a combination of static lights and stationary lights, for a better performance*. But I’ll check the lightmap res of my assets, so thanks for the advice!
*(PS: I’ve noticed that the Static lights doesn’t count for the light overlap when the lightmaps are generated. It should work right, doesn’t it?)
Absolutely, now the lightmaps are right, it works perfectly with static lighting! Thanks!
