Well, I mean that Mars sometimes displays a slightly different version of its texture because it appears that developers mistakenly added two default textures instead of one.
However, you are correct, Triton and Titan needs proper textures.
In my opinion, all the planets and moons in our solar system must have updated textures with better resolution, better graphic visuals and more sharpness.
The textures of Venus and Uranus does not look right. Developers have to change them so that their texture look exactly like the real Venus and the real Uranus. I have written a post of that already. Search for it and read it, and post your suggestions for Venus and Uranus textures.