Global light bug

I want to make a space scene with only dynamic lights. Here I have a scene with directional light (sun), and different space props. Can’t understand why some asteroids here have incorrect lighting, these asteroids in the bottom left are too bright, while big asteroid in the right part of screenshot have correct shadow that hides him on the black background (asteroids have the same material). When I started the project everything was fine, and deeply between asteroids it was dark and hard to navigate without flashlight or smthg, but after I saved project some times I launched editor today and found that bug. Meet this problem not at the thirst time, when I start project everything is fine but after few saves it’s something like global ambient light is appear, so what is wrong in my light settings?

Enable Force No Precomputed Lighting in World Settings and see if it helps.