The Gift Delivery turret sprites appear to not be aligned to their selection box. Normally, artillery turrets have the bottom of the turret aligned so the bottom of the sprite is aligned with the lower inner bounds of the box. The gift delivery turrets are moved what looks like half a tile or so down so it's centrally aligned to the box. It's more of a personal gripe than an actual gamebreaking bug, but it's kind of annoying when I want to use an inserter to put gifts into the turret and I try to align it to the bottom of the turret. Provided are links to screenshots illustrating the alignment issue.
Gift Delivery Turret https://i.imgur.com/F7Kkgdg.png
Artillery Turret https://i.imgur.com/FTAsQcx.png