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 the changes on the Form Designer did not reflect directly on your form.
I simply disable and enable the "Cover" option in the "Background Image" in the Form Designer Tool then saved the changes, the background image on your form now is fixed and will not move.
Let us know if you are still having problems on this.
Thank you very much!