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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I was not able to reproduce the issue.
However, that is quite unusual, especially since you have embedded your form using the Iframe, this means that the form is loaded on Jotform server-side, and responses from the submit button should not replicate.
If you can reproduce, please copy the detail error report on a reply to this thread: