Why each part of the wall is reacting to rendered light differently?

[scarlet whale]

I made this in blender, and even with different materials eac block reacts to light differntly even thought its 1 mesh bade in blender, i checked the LightMap UVs, redid them and they are close together. Im really not sure what causes this

[green summit]

"checked" and "redid" the lightmap UVs how exactly?
Normally you just need to enable lightmap UV generation in mesh import settings
Right now looks like they have no functional lightmap UVs at all

And/or the relative lightmap resolution is so low nothing practically shows on them, which is another symptom of missing UVs

https://docs.unity3d.com/Manual/GIVis.html
Use the scene view debug modes to troubleshoot lightmap UVs and the baked lightmap itself

[scarlet whale]

okay will do

so i do check to enable lightmap UV generation in mesh import settings but ill check this doc thank you

then i also made a UV in Blender