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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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Can you please tell us which of your form was having this issue?
I checked and tested all your forms on your account but so far, I could not find which form hidden label issue.
The last jotform http://www.jotform.us/form/50644855822157 you used also have no such issue at the this time.
Please let us know if issue remains.