I can't help with that but my new system was really out of whack when I got it.
Right side scales read off by 26g as a pair {reading heavy}. It took a lot of off balance calibration to get them to scale a car correctly.
I saw two other sets that had similar problems.
Bad thing is if you trust them to be right and not pay attention your car will be out of balance and cross weight will be off a lot.