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.
Upon checking the direct link in your form, which is this one: http://www.jotform.us/form/51073182402141. And your website link, it seems likes you have a code conflict between your website and the form's design by embedding the form's full source code.
I would recommend that you embed using the iFrame code instead, here's a guide on that: http://www.jotform.com/help/148-Getting-the-Form-iFrame-Code. That should make your form to display correctly in your website.
Do let us know if that works.