Hi @GregValiant, thanks for your reply but no, the facets are intended and not the problem that I am describing.
In the image, both the faceted and spherical balls show the same problem: there are additional layers on the insides of the balls, but only at the bottom. With the chosen sizes and settings, both balls are suppose to have wall thicknesses of only 2 layers, but for some reason both show additional layers. In the new attached image, I hope this detail is a bit clearer. I also attached the project file. The spherical file is very large because of its high resolution so I did not attach it, but it's just a solid sphere.
WDI3M_balls.3mf