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I tested and could replicate the same situation:
I have forwarded this situation to our developers so they can investigate further the causes of this situation. We'll contact you as soon as we have more details.
We just received news from our backend team that this has been fixed. Could you please try again?
Also, please check this guide to learn more about the fillable PDF forms: http://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator.
Thank you for your patience.