on the passenger side of my car, my rear suspension sits lower than my drivers side rear suspension, almost an inch i th ink. I don't have any coilovers or lowering springs, just stock everything, what could be the problem?

 

Damage from a previous accident.
Severely worn suspension bushings.
One of the front shocks incorrectly installed in the fork (can make one corner sit higher).

 

is it anything serious? my car rides fine, i only noticed it because i measured the space between the tire and wheel well or whatever its called