This article describes how to resolve ghost reservations. Ghost reservations occur when you change the settings of the court in a way that prevents a previously scheduled reservation from fitting in the slots. A notice will appear alerting you of this situation.
To resolve a ghost reservation, scroll down to the bottom of the page. You'll find the Ghost reservations table.
Click the blue Cancel button to remove the ghost reservation. You can re-book the slot from the primary reservations page.