Hi there,

I saw this article regarding this issue:

https://www.tipsandtricks-hq.com/ecommerce/automatically-return-customers-from-paypal-to-your-thank-you-page-3082

But I guess WooCommerce will do all the work, so all users after successful payment they will be sent to thank you page and order details.

None of the customers had this issue in the past, so I guess the default WooCommerce options will sent back the user to thank you page.