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.
I took a look at your jotform and I can see that there are conflicting codes on your website that are not allowing it to work properly.
For example, you could take a look at the date dropdown - which has gray color text for options instead of black as shown when you go to your jotform directly: http://www.jotformeu.com/form/51095481582358
Due to the conflict, the only embedding that would work properly for you is to use the iframe embed code.
Do let us know how it goes and if you have any further issues after doing so.