Did you also measure the height of the frame rails from ground? If this is ok it could be just some bad alignment of body panels… Had a similar “issue” with my front bumper…
Could also be, that the curb-/ride-height adjustment on either side of the suspension got out of specs and needs to be corrected ….
It is very possible that your wishbone pivot bushings were tightened with the suspension drooped. This will cause preload in the wrong direction and hold that corner up. At a bare minimum, they should be torqued with the suspension loaded. Optimally, they should be torqued with the car ballasted per the manual.
Eliminate a few of the less obvious possible causes first. Are all the tires pressured to spec, same tires all around? have you measured frame to ground on all four corners at the axle line, should be about a half inch rake front to rear also. If nothing obvious consider a weak spring, you can verify by swapping sides.
I have an issue with my Viper’s body height. Its a 1998 RT 10 Passenger rear is approx 1″ higher. Has no accident history and seems to have no damage to frame/ underside. I’ve owned the car for about 1 year, and it has been in a garage most of the time. I also have wondered if there is modification/ adjustable coil overs aftermarket, if there is a major problem with the frame.