I really can't see the grooves in those pictures well enough to guess what caused them. It all just looks like a blurry mess. For all i know, i could be looking at a tree branch with splines carved into it lol.
lol i hear ya but thats as best as i could do, look at the third pic on the right it shows it the best, when i torque it down with the spacer it will make a grinding noise when i turn the axle so i have to loosen the nuts off to keep it turning smooth but when i do that the nuts arnt tight enough so there always coming loose after every ride .