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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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I did check our contact page in my iPad device with Safari and I am unable to replicate the issue you are having. I was able to input without any problem. Please check the screenshot below:
I would suggest you to clear your browser cache and try again. The following guide should help you on how to clear browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache#Safari_for_iOS.2C_iPhone_and_iPad_sub
Do get back to us if the issue persists.