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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I have checked the form in Firefox and I can see there is a problem with the form fields padding, I would suggest you to inject this code to your form:
padding: 0px !important;
This guide will help you to inject the code to your form: How-to-Inject-Custom-CSS-Codes
Hope this helps.