Ron,
What does the left front look like? If the left front spring is off it's seat, the LF will be high and RR potentially low.
I've got two other guesses:
1. Height adjuster moved like you said
2. You have some bind in the suspension bushings and it wasn't fully "down" when you set it up. After the TH jump, the suspension is now fully settled.
Other long shots would be a torsion bar that rotated (damaged spines) or maybe some extreme weight transfer in the car (you didn't load all the beer in that corner did you?). I'd say both are long shots
I always check alignment and ride height after each race BEFORE I jack the car up because I know the suspension is fully settled out. It is hard to get it perfect again just by bouncing and rolling out.