What is the reason why KFC breakfast two-piece set is directly removed from the shelf?

Tech Planet reported on March 29th. On the morning of March 29th, the official account of KFC responded that it had been restored due to system failure.

KFC said that the Deji breakfast two-piece set was taken off the shelf because the ordering system suddenly broke down, and the set meal could not be displayed during breakfast today. After emergency repair, it is now being restored. And said that it will extend the consumer's Great God card for one day within 48 hours.