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.
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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 did test your form and after the submit button was clicked, it shows a page with heading "Form Closed". Please check the screenshot below:
It seems you have set "Custom URL (Thank you)" in your form which is redirecting to to FormCentral page after the form is submitted. Please check the screenshot below:
Please change the "Custom URL" of thank you page of your form and that should solve your problem. The following guide should help you: https://www.jotform.com/help/38-Redirecting-Users-to-a-Different-Page
Instead of redirect users to different page, you can also show the default thank you message or custom thank you message as well. The following guide should help you: https://www.jotform.com/help/211-Setting-Up-the-Thank-You-Page
Hope this helps.
Do get back to us if you have any questions.