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.
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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'm sorry for the trouble caused to you.
I did check your web page and I am unable to replicate the issue you are having. Your form does display the calendar field correctly without any problem. I did check your form in multiple browser and it seems to work as expected.
Are you having this issue with any specific browser and OS? Do let us know and we will take a look. I would also suggest you to embed your form using its iFrame embed code and see if that solves your problem. The following guide should help you grab your form's iFrame embed code: http://www.jotform.com/help/148-Getting-the-Form-iFrame-Code
We will wait for your response.