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.
When I checked the form http://www.jotform.us/form/51075123964151 I also see that it wasn't using any Theme
Please try this process
1. Open the form in the Form Designer
2. Save the Form while in the Form Designer
3. Close the Form Designer and back at the Form Builder..
4. Save the form.
Let us know how it goes.