I’m working on a scene and noticed that the female atom’s butt morph isn’t perfectly round—there are visible surface irregularities. I customized the female atom to have a larger butt, so that might be affecting the mesh. Any idea how to fix this?
Welcome to gamedev, characters don't have unlimited polycount
It's not a bug or defect, it's normal. Unless you use shaders that will push the polycount like RunRudolf suggests, this is a completely normal behavior.
Note: Smooth pass is recommended at "2", because you will have counter-effects of pushing it too much (like slight deformation on the face of characters). Not always a big problem, but can be obvious on some characters.