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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Have you tried making the form mobile responsive? Here's a guide that you can follow: http://www.jotform.com/help/311-How-to-make-Forms-Mobile-Responsive
I also noticed that your form is embedded on a website, could you please share us the website page where the form is embedded so that we can better check what is causing this problem. We'll wait for your response.