Transparent PBR MAT on a Sphere, help me with lights!

in this project I was exploring with transparent PBR MAT, I made a transparent sphere with two colored light sources, one in the front the other in the back, however the sphere lighting on the surface appears uneven (there is a definite separation in the texture). I guess it is for normals or UV mapping …

Can someone help me figure out how PBR MAT Transparent lighting should be set to achieve a realistic effect?

PBR.TEST.toe (6.9 KB)