I didn't notice this until this morning. After messing around with moons in a simulation, I noticed that all the moons take on the same color, the texture is different, but the same color. Our moon's texture seems to be unaffected. I loaded a pre-made simulation to make sure it wasn't the climate simulation making things glitchy. The moons in the Jupiter & Moons simulations also have the same color (like Lo, Dione, Rhea, etc). Same with the Saturn & Moons simulation. All moons large enough to be spherical have the same color.
Is this a bug, or intentional? Here is a screen shot.