I had this problem too some times. The reason ,because ultimapper generate this normal map weird, is becaue one of the 2 island in the UV editor is flipped orizontal (or vertical).
Is a very strange bug, but try to re-map the sphere in the way that no islands are mirrored.
Usually it work ,i reccomand you any way, (until autodesk don't correct ultimapper...hahaahahahahahah......sigh...never happen....) to try Xnormal. I'm using it for some cases where ultimapper show the bulge bug. And is also more faster.Good work!!!!!!!!
