Revenue/Product Scheduling

I have scheduling set up for monthly installments. The total amount for a one year contract is $9,530.40. When divided by 12 this should be $794.20. However, the report I created to let the users know when to send the invoice, divides it into 11 payments of $794 and one payment of $796.40. I thought it would divide into equal installments. Any thoughts or solutions?

Thanks

Ellen