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.
Have you embedded the form to a website? Or, are you using the form direct link (custom URL) ? If the form is embedded, then the most possible reason is a conflict between your website scripts and the form scripts. Re-embedding your form using our iFrame method should help you fix it.
If you are using the form direct link, then I would advise to just re-save your form into our form builder. After that, clear your forms cache by following this guide: http://www.jotform.me/help/229-How-to-Clear-your-Form-Cache.
Hope that helps! Please let us know if the issue persists so we can check further.