Installing the mod with shaders on makes the lava transparent, especially SEUS shaders.
Shaders made by other creators seem fine as far as I know (see examples)

I don't know why the mod changes lava textures or something like that because it only adds mobs. Makes no sense to me
Except if it's because of the required lib mod (Citadel)

Mod List:

Vanilla:

SEUS HRR:

SEUS v11:

Conquest Of The Sun * OK *

Sildurs Vibrant Shaders v1.22 Extreme-VL * OK-ISH *

Same for #70, didn't check but I'll leave this one here because screenshot examples are great