Jingdong system problems, factors such as payment, delivery and inventory, risk control mechanism and purchasing behavior, etc.

1. Jingdong system problems: The inability to place orders is due to Jingdong system failures or technical problems.

2. Factors such as payment, delivery, and inventory: payment failure, the seller's inability to deliver goods in time, or insufficient product inventory will all affect the successful creation of orders.

3. Risk control mechanism and purchasing behavior: As an e-commerce platform, it has adopted a series of risk assessment and preventive measures to protect user rights and safety. If the purchasing behavior is abnormal, using an abnormal IP address, making frequent purchases or exceeding a certain limit, the system will mark the order as abnormal.