Yes, they're literally shorter than the other one... or Marcinkowski is simply happy with them being a bit higher than when they're facing right.
When a weapon's facing right and it has a lot of height, the graphic starts drooping
downward as well, the opposite effect
It's kinda stupid, but if it was fixed it would mess up every single current mod, and also the scenery-gfx on maps, which also depend on the corner-pixel for rotation