Yep. What happends is if you stand the coils on flat ground(with the flat side down), there is a point on the top where the coil spring ends. It is the highest point of the spring because the backs(on a Mark8) don't have flat ends on both sides, so if you look at it, the coil spring is just cut off. If you set both coil springs side by side they will be the same height, but on the car, the portion of the subframe where the top of the coil sits is at a slight angle, leaning away from the top of the spring.
So....since both sides of the subframe have that same angle, if you position the coils wrong, the highest point of the coil spring is going to be sitting on the angled part of the subframe in a different spot. This will change the height of the back of the car by probably 1/2" from side to side.
Think of it like the hood alignment bump stops, one half of a turn and it corkscrews out and will raise the hood. Same affect, but with a coil spring.
(For reference only, these aren't M8 springs) Here you can see how the coil just stops and is slightly higher than the other side of that same coil.
This shows how the "weight" is spread even among the two springs when they are faced in the opposite direction.(the spring on the left is slightly higher than the one on the right, not part of the demonstration)
This shows how the "weight" is spread un-even on just the end of the left side coil spring, also note how unlevel the clipboard is now.