What is the group size ie to the left? Hw far to the left? Does anyone else shoot the gun and does it still shoot to the left?

If it is shooting OK from multiple positions and it is consistent, can you tap the sights over a bit to compensate? If so easy fix.

As you probably know a double if shot from a rest should be held in your hands, and your hand resting on a rest, not the DR. If you are shooting like this, or from freehand, then it is shooting to the left. Adjust the sights, I<O.