I had some weird stuff like this happen when I went into post-secondary classes. I had taken some programming classes as part of the so called gifted program in elementary school and my student account was configured wrong from being made before several large changes to how student accounts were managed. I got to keep my student number which had two fewer digits than everyone in my class at least, but the id verification, emails, phone calls, and taking a number and waiting in line were all a pain and I almost missed the registration deadline.