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.
I'm sorry, but I'm afraid that this is not possible. This is because of the fixed header of your website. Your other web contents are even doing the same thing. It scrolls up beneath the header/navigation. The Wix builder adds to that. Do you have a way to edit the HTML of a specific fix? Maybe you can play around with it not to have a fixed navigation.