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I've tested your JotForm that is embedded on your webpage http://www.ncsphotos.com.au/#!order-form-2015/c1643 using my mobile and I was able to access the form and submit the form without any issue.
I believe that you are referring to the same form titled School Photos Order form 2015. Please try embedding the form using URL method instead using iframe code and see how it works. Also, please try clearing the browser cache on your mobile by following the steps provided in the guide below :
Please get back to us with the mobile model and webpage URL where the form is embedded if you need any further assistance. We will be happy to help.