Enabling the Void-Fog seems to increase the density of the default overworld fog.
I've nothing else installed that could cause this kind of issue:
-Minecraft v1.18.2
-Fabric Loader v0.13.3
-Fabric API v0.51.1
-Void-Fog v2.6.2

screenies:

Void-Fog toggled off (Creative Mode):

Void-Fog toggled on (Survival Mode):

Oh so THIS mod causes this? I love it actually, the fog feels more realistic this way and less like a world border :D

Ooooh so THIS is what's been causing that. Damn, I had no idea. I'll see what I can do to at least implement that as a toggle in my fork.

Since #13 is merged (and soon to be released for 1.19.2 and 1.19.3), I think I'm gonna close this as resolved.