just found out my cars' right hand caster angle is at 0.3 degrees than at 2 degrees. suspension is stock and caster is not adjustable. does anyone know what i can do to fix this?

 

Drive into potholes with your right wheel in reverse, so that you will bend your LCA back to where it's supposed to be. Or you can look around the suspension (right side) for bent parts (most likely LCA), and replace whatever's bent.