Completed confirmation is not showing after payment and form submission

In the form settings for the form embedded at https://tennesseeprayerbreakfast.org/registration we have selected to use the default "Thank You" confirmation. It just shows a blank box instead. This leads people to think that their payment did not go through, but it has. Then they try again making a second payment that we have to refund.

The form is embedded using the script embed method. The payment method used is Paypal Payments Pro.

I just checked your form and it seems that you have selected the Redirect to an external link, and the link is missing. That's why that was showing on your form.

Please change that to Thank you page first.

Note: Every time you make change changes on the form you need to generate the script method and put that on your website. 

I had just clicked on that to see what the parameters were and you just happen to look at that time. The error is occurring when the default thank you option is selected.

I have tested your form and I was able to replicate the issue.

The issue was appearing in the form I just cloned as well. I fixed it by making a simple change in the Thank You (adding an extra ! and removing it again) page and it seems to be working correctly now.

Let us know if you need further assistance.

Thanks!