The props rotate different direction to the one above or below it.
Think of it as an X. They do that to counter rotation and extra stability. The blade still provides lift of course, but yeah it is weird when you install the props the first time
They are brushless motors so the casing rotates. The prop has teeth that catch inside the motor case and lock into place. Obviously you get two sets and they are different.
If you look closely on the top they have a direction arrow on them.
Far as how it sits on the ground I don't really notice anything about the control of it being different as to if it was level. Seems to fly right and when in hover it is level as a laser.
Likely it is just design, but make no mistake there is so much computer shit in this bitch.....it is nuts.
I know nothing of drones. Why are the propellers offset? Wouldn't that make them unbalanced?