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Are you referring to this form - http://www.jotform.me/form/53492692786472)? It seems to be displayed properly when I checked the form. Are you still encountering this issue? If you have embedded your form on your website, can you give us the link to the website where you embedded this form into? This will help us further investigate the issue that you are having about the height of your form.
We will wait for your reply,