[Autumn]

Are you referring to it being that it used to shoot you diagonally? I believe that was changed during the whole knockback changes to Typhur and other knockbacks, where they couldn't blow you away diagonally any more, simply because pushing back someone diagonally 3 tiles would essentially be 6, due to how moving at a diagonal costs you 2move, simply put they were too strong for kiting when being used at these diagonals, parting shot is the same way, you're supposed to move 3 tiles away, and then your opponent would need to move 6 tiles to get to you.

If you're referring to it being changed as of recently, I believe the problem with ambidexterity made it so that Parting shot just planted you beside someone similar to hanging, which was then changed again to slide you back properly.