The ‘little box’ thing was only added a few years ago, and about that time the DRT ‘went dark’ for fraud protection reasons so you can’t see the income on the FAFSA. It is a common mistake but I don’t think there is a way to correct it online, and not sure it is something FAFSA is even trying to correct because of the fraud issues.
@kelsmom may be able to inform us if one school can change it for all schools, and if the FAFSA has to be resubmitted to other schools after the correction is made by one school.