Odd lighting between different brushes

[Cincomma]

Hello all, I've an issue that I need to fix

I've been working on a map of mine and after I ran it, this happened between 3 brushes

They have the same lightmap scale, and no props that would mess up the lighting. There's a room inside this building as well, I've also ran into this problem with a few other maps I've made

I'd appreciate if someone tells me if they know

Thanks!

 

[Da Spud Lord]

Do all of the brushes have the same texture alignment? If so, have you tried putting all those faces in the same smoothing group?

 

[Panckakebro]

Is the texture aligned? Hold alt and right click to align the textures on those faces. Also, if you don't have nodraw on the non visible faces lighting can bleed through.

 

[Cincomma]

alright, so I have done all of that already, but how do I change the smoothing group?