Once a registration has been cancelled, you will no longer be able to issue a refund or apply credit in your organization account's administration interface.
If you need to issue a refund to a cancelled registration or need to refund a greater amount to the cancelled registration, please Report Issue and Contact Endurance Support.
Note: When cancelling registration without issuing a refund, the system issues a refund that is cancelled out by a cancellation charge - as such, the dashboard displays the refund amount. When a refund is then issued for the cancelled registration, that refund amount is also added to the refund total in the dashboard causing it display a greater amount than was actually refunded.