The same thing happened with me. There was a huge difference between what I calculated and what they calculated. I don't know if it's because they had 400 applications and they were rushing, but I was told to do the petition request as well. I emailed and asked for a copy of the multi-criteria sheet for my application to make sure I didn't calculated it wrong. I thought they would send it, but didn't expect them to tell me to petition. It's very frustrating.