Which tool/project is it exactly in Lightbox, by name? There are a number of spheres. Do you have this problem with any other mesh? I wouldn’t submit a support ticket unless it’s a persistent problem in your program operation, and not just one particular mesh that might be problematic.
As previously mentioned, make certain any masking is cleared. Even if not visible, manually clear it. Occasionally, an object can inadvertently become partially masked. Having symmetry active can also make for odd distortion at times when transposing, depending on what you are trying to do, and whether the areas of influence are overlapping in a conflicting manner.