mason - by your screenshot I see that you are working with an old event. Users can not edit records for an event that is already over. That is automatically disabled after the event ends. Why would a user need to edit their registration AFTER the event? No bug here.
Please download the new 2.6.1. A number of fixes have been applied as well as a couple new items. If you still have an issue after upgrading, submit a support ticket. Thanks.