Backup camera lines not aligned with tires

When backing up, the lines on the screen of the back up camera do not align with the tires. Backing between lines according to the screen will put the passenger's side tires almost 12 inches OUTSIDE of the parking space. When brought to the dealer's attention upon first oil change, they said they hooked it up to the computer and everything is fine. DUH! the camera is functioning correctly but the lines (wheel position markers) are not aligned properly and will have my vehicle almost 12 inches away from the edge of the driveway where my tires should be.. Does anyone know how to adjust the tire line markers on the back up camera view?? I understand that the camera itself is a solid mounted camera with no adjustment screws available so there has to be a way to adjust these from the screen or other means. Help please!! The auto-parking feature on this vehicle has never been used because of this. That likely utilizes sensors and not the grid overlay but who knows?