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.
It seems like a false positive result from Avast. It is quite common for Avast to block scripts that seems suspicious in their end. You might need to contact them directly by following their forum in this link: https://forum.avast.com/index.php?board=4.0. Or you can whitelist it on your Avast antivirus, I am not quite familiar with Avast so I am not sure about the menu of it.
My antivirus Eset does not block JotForm, it might be isolated on Avast perhaps? Do let us know if that helps.