Multiple biomes being able to exist in the same place is intended, but not to this scale. Can I get a method of reproducing this as well as a copy of the log, mod list, and quark config?

I unfortunately already fixed the config, it was ~5x size cave biomes capable of spawning anywhere.

I was using Caves and Cliffs Backport with Darker Depths, dependency BGcore/CaveBiomesAPI, and due to physical biomes spawning quark cave biomes didn't generate, so I set them to spawn anywhere.

And made them bigger.

I unfortunately already fixed the config, it was ~5x size cave biomes capable of spawning anywhere.

Yeah that'll do it lol