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.
This happens when the user closes the browser or did not complete the payment after being redirected to the PayPal checkout page. Please take note that completing the this will not process any payment.
This is the reason why you are not getting any email notifications. The email notification will only be triggered once you complete the incomplete payments. There's an option wherein you'll be notified when there is an incomplete payment, here's a guide: https://www.jotform.com/help/273-How-to-Setup-Incomplete-Payment-Notification-E-Mail.
More information on this user guide: https://www.jotform.com/help/272-Paypal-Incomplete-Payments-FAQ.
Hope that helps. Thank you.