Wordpress / WooCommerce /PayPal Problem

I have a problem with my Wordpress / WooCommerce and PayPal website since when making a purchase it make the Charge to Paypal and the confirmations by email arrive both to the buyer and to the administrator but the website shows the following error:

Failed to process the payment. Please try again or contact the shop admin. [UNPROCESSABLE_ENTITY] The requested action could not be performed, semantically incorrect, or failed business validation. https://developer.paypal.com/docs/api/orders/v2/#error-ORDER_ALREADY_COMPLETED

The paypal plugin is activated and everything seems to be fine even as I commented before the payment is processed and leaves the buyer's account and reaches the seller's account. But the website shows that error, I need a qualified freelancer with experience in integrating Wordpress, to help me fix this issue.

Ideal skills and experience for the job:
- Experienced in Wordpress development and troubleshooting
- Knowledgeable in WooCommerce and PayPal integration
- Familiar with database management and troubleshooting
- Able to communicate effectively and provide timely updates on progress