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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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I cloned your form and I can confirm that there are missing fields on the preview.
It looks like the conditions are causing this issue as there are errors in them.
I removed the conditions in the cloned form and the form now appears as it should.
I suggest you remove the conditions and replace them with a new one that has no errors.
Do inform us if you have any other concerns,
It seems like that you have removed some fields after adding conditions to them. This invalidates your conditions and your form appears like it is now.
As my colleague already suggested replacing or correcting the conditions will solve your problem.
Thank you very much