Emissive lighting not working correctly in UE 5.6 importing from UE 4.??

Hi, I originally created my Unreal project in a UE4 version (unsure exactly which), and when I upgraded to UE5, everything seemed to work correctly and look the same as before.

However, now that I’m trying it in UE 5.6, emissive lighting no longer responds properly to the Post Process Volume.

Before:

Now:

I want to point out that the only light sources in my levels are static meshes using materials with emissive colors value between 1 and 2. My project has always used Lumen, and that hasn’t changed. My Exposure on the PostProcessing Volumes is about 12.5 and manual, with the light meshes being quite spread out and not near each other, combine that with a small emissive color value and you get the original dark look, but I don’t know if that’s the cause of the current issue since even with a lower Exposure value, the textures still seem off.

The only thing I had to enable upon opening the project in this version was D3D12 / Shader Model 6.

I would really appreciate If someone would be able to help me tweak my Rendering settings for the project, or whatever is necessary to resolve this issue and with as little repetition as possible