I don't know what could be causing it. I'm using better starmap background, grog2's 4k planets and planetslib and I don't see the rings with the mod installed.

I use the same mods and doesn't work for me either.

still don't work

It seems to be incompatible with PlanetsLib

Sorry for taking so long to respond, i don't usually check the website all that often. I'll work to test some solutions in a bit and get back to you if i find one.
I'll also edit the mod description to say that some mods that make changes to the starmap may mess up the mod.