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 should be fixed now. You have enabled Responsive Form that's why your form expand to full width.
Here's how to disable Responsive Form.
If you want your form to be fully responsive on mobile without distorting the form layout on desktop mode, use this widget instead. http://widgets.jotform.com/widget/mobile_responsive
Hope this helps. Thank you!