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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As I test the JotForm to submit using direct link, it was fast and submitted without any issues. This seems to be a conflict with other scripts on your webpage. Also, I notice that your JotForm is not displayed completely on your webpage.
Could you try embedding the form using iframe method and see if that resolves the issue? You can get the iframe code by following the instructions provided in the guide below :
Please get back to us if the issue still persists. We will be happy to look into this issue further.