Obviously, if you made the measurements correctly, you have unequal caster R&L. These measurements assume that you are on level ground and your ball joints are in good shape. If mine, I would jack each wheel off the ground, put a 2x4 under each wheel, lift the wheel up and down vertically and check for play in the ball joints. It's good to have a helper for this. If no play, I'd shim out both LCAs equally then re-measure.