Hi there @jackg17,
thanks for the update !
If your subscription status says you're on Premium now and the next one would be a Student plan charge, it means there must have been an issue with your eligibility on this month.
It's a good start that it states your next billing date would charge you for the Student plan.
If there was no change in your account like payment method, e-mail etc that might have caused it, please check out this refunds page for further info.
Hope this helps :)