It can only be one thing then, the spring is badly tempered, and won't hold it's rate. It happens infrequently that the heat treat isn't adequate, and a spring will sag as it shows in your pictures.
If you had a spring tester, and compressed each spring, it would likely show the one has way less rate than the other.
The manufacturer should have some warranty on them, so I'd contact them, showing them your pictures of left, and right sides comparatively. If you have one of the back of the car showing it listing to one side, that would also be helpful.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
|