How to light various objects evenly?

Hello,
I am using the sky and fog settings (for my volume), and noticed that after using a volume, the lighting on each individual game object is different. I have a wall (which is a single game object, which is fine), but there is a script attached to the wall that instantiates the wall into multiple game objects (to fit around my doors), and then assigns the parent of the instantiated objects to be the final wall, and noticed the lighting is weird.

 

Use tonemapping.

 

I am already using tonemapping.

 

I am using tonemapping, and still have trouble with various game objects having uneven tinting.