Internal structure only visible in layers, Cura

cura

#1

Using 3DSMax, I pro booleaned a sphere inside a box. It looks fine in Max. In Cura, when viewed as solid, it is fine but when viewed in layer mode there is an internal structure that doesn’t show up anywhere else. As it doesn’t show up in Max there is no way I can fix it. Has anyone else had this problem, internal structure that only shows up in layer mode?