Are you saying that, in one year, you haven't learned anything about yourself or your prospective career? You statement is a chance to step outside of the stats and interest schools in interviewing you. It's not a box to check.
You need to visit CASPA website and see how they grade certain courses.
Some of your classes may have been graded differently EX. pass/ fail classes, quarterly hour classes.
or post a picture of the pdf CASPA gives you and ill take a closer look. Im having a hard time following your excel sheet.
I don't understand what you are saying they miscalculated.
If you're saying the grades you calculated yourself are different from what CASPA calculated...well welcome to CASPA heartbreak.
If you are saying they entered courses wrong (different from what is on your transcript) they WILL fix it. They forgot to enter my biochemistry course for some reason so I had to shoot them an email.