The reasons are as follows:

1. Network problems: During the payment process, the network connection is unstable or interrupted, which will cause the payment status to always be displayed as paying.

2. Banking system problems: The payment system of Bank of Communications failed or was under maintenance, resulting in the failure to complete the payment.

3. Insufficient credit card limit: Insufficient credit card limit to pay the order amount will also cause the payment status to always be displayed as paying.