When registering the required field "Relationship to Student" was not able to chosen. This appears to be an error from last year too. While it is nice that they migrate your contact information, you have to delete the contact and resubmit it in order to get the drop down and correct error preventing submission.
Hope this helps.
Thank you for bringing this to our notice. I have escalated this to the Enrollment family support product team to have the drop-down for the 'Relationship to Student' field within the Enrollment form reviewed. I will update the thread once I receive an update from the Enrollment team.