Is your A-number correct ?
Go to the appointment and try to sort it out. They f up peoples names and other data all the time (people have gotten 'FNU' as their first name, their birthdate as 'permanent resident since' and other oddities.)
Once you go there, they can pull up your name in the computer and make sure that your fingerprints go with the right dataset. I don't think there is anything you can do before the appointment.
