I successfully completed the payment flow to PayPal

I successfully completed the payment flow to PayPal and returned back to my site. After a successful payment on PayPal, I got this page:

"Oh No, we can't find your Donate Now. Sometimes it take a few moments for your Donate Now to be logged. You can try refreshing this page". The same page does include the campaign's Featured Image.

What does this message mean? How can we just display a standard confirmation message for a successful payment? Need help ASAP.

Thanks!