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 looks like the repeat option for the page background is not set correctly. Please try enabling the Repeat option for Page background in the Advanced Form Designer if it is already disabled and save the form. Now, disable the Repeat option again and save the form.
This should be fixing the background to fixed and let the form only to scroll. Please give it a try and let us know if you need any further assistance. We will be happy to assist.