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 inspected the form and your site which you've the issue. But I cannot replicate the issue. Please could you view the .gif that I shared below.
As you can see from the .gif image when I scroll down the pop-up page, I can see the "Submit" button. Also you can check your submit button directly from this link.
I can also check and see the submit button from the direct link which belongs to your form. Would you please check it on your side by following my way?
If your problem persists, don't hesitate to inform us via this topic and please give us detailed information such as which devices and browsers do you use etc.