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.
As I clone your JotForm to my account, I see that Loose check is enabled for Unique submission to limit form submissions. This option will enable the form to check cookies for previous submission and doesn't allow duplicate submission from the same browser. You can change this option from Form preferences -> Form Limits tab.
Hope this information helps!