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 your JotForm and see that the text is being entered normally in the text boxes. However, I notice that the font color is set to white and so it is not being displayed on the white background.
You may change the font color on your JotForm from the Form Preferences > Form Styles. Please see the screenshot below that can help you in changing the fort color on your JotForm.
Hope this information helps! Please get back to us if you need any further assistance. We will be happy to help.