I think what you are seeing is (about) 3 edges of the shell-style hair mesh layers, one behind the other. You could try playing around with the transmaps (tapering the ends of the strands), but other than that there isn't much you can do. If the 3 layers all ended in the same place you would have a hard edge, this arrangement is probably better. Now you see one of the reasons why I gave up on this kind of hair. ;-)