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.
I've tried cloning your JotForm and I was not able to reproduce the issue. As I tried to submit your JotForm, I see that the submission didn't go through and Thank you page is not displayed. Were there any recent changes made to your JotForm since it worked last time. Could you try restoring the form to the recent version that worked and see if that works?
Let us know if the issue still persists. We will be happy to look into this issue further.