rear wheel offset on Miller/H-h front boom

Hi all, I noticed my rear wheel are offset about 2 inches to the right compared to the front wheels. Machine is a N-H Sp 240F with 4 wheel steer. 4 wheel steer locked and the offset is making the machine running at a very small angle. I thought when it was locked it didn't have the choice to be straight. How do I adjust that?

Thanks

rear wheel offset on Miller/H-h front boom