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.
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I've cloned your form and I was able to replicate your issue, I remove the actual integration with Stripe and re-integrate it again, and it's working on my end.
You can see my sample form here :
Let us know if it works, if not we will be glad to assist you.