Help me explain skill targeting?

I was wondering how this actually works. I mean, how It isn't supposed to work, I guess. This is just plain wrong, how is it even possible and nobody took notice of it yet?

Look at this: Not the best quality, i know

But really now, I am CLEARLY aiming straight at the ground to hit down there, but the shots all go straight along the pipe...what? Why...?

Hey, I don't play anymore nowadays, but I'll explain. Stickynades and Concussive Grenades have the same projectile spread no matter your vertical cursor position. The only thing that'll truly affect the projectile motion will be if you sway your camera while shooting it (obvious curved projectile path) or if you're in mid-air, which causes all five projectiles to land relatively accurately to one another as opposed to in a line.

That I already know. The problem with it is that it shoots at an angle and it's not even where I am aiming. It just flat out shoots to the side of the cursor instead of a straight line ahead of me. Makes no sense at all lol