Hi Jon
I'm using Moodle version 3.8.1 (Build: 20200113) and Adaptable theme version 2019112603
Yes I have a custom profile field for grade. When a user completes the registration form he/she automatically gets added to a cohort based on grade selection.
I registered as a user for grade 8 now. When I click on the link in the email confirmation it takes me to the confirmation page. When I click on that 'continue' button it takes me to grade 10 instead of grade 8. (See screens prints attached.)
Link for grade 8 course: http://elmarievanzyl.co.za/exams/course/view.php?id=3
Link for grade 10 course: http://elmarievanzyl.co.za/exams/enrol/index.php?id=4
Thank you.