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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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This is happening because the "Text" element is set to "Required". The solution is to un-require it.
You just need to select the field and then click the "blue down arrow" icon. After that, click on the "Required" option. Here's a screen capture:
After doing that, please test your form and verify if it is now working or not.
Hope that helps. Thank you.