What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It is because that you have a PayPal integration. When the user hit the submit button, it will be redirected to PayPal checkout page.
The user will be redirected to the PayPal confirmation page after completing the payment. In that page, there is a return link wherein if the user click it, he/she will be redirected to the Thank You page you created in JotForm.
If you want to redirect the user back to the form, you may enable the "Auto Return" function in PayPal. Here's a guide: https://www.paypal.com/ph/cgi-bin/webscr?cmd=p/mer/express_return_summary-outside. The URL that you'll enter in the Auto Return should be your website.