They waviness is going to be the hand finsihing on a buffing wheel. Note how the dehorning isn't absolutely uniform. It was was finished, that's all, not CNC'd dehorning. The slight troughs shown also look to be from the polishing wheel and maybe a bit too much pressure, possibly buffing out a rough spot.
If you don't like it, get an Emery board and some Flitz. It is a $250 pocket gun. I don't think I would sweat the slight undulation too much.