JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Since Input Mask property was already disabled on the form http://www.jotform.com/form/11452923256, can you please remove also the Mask Value in the property of the form.
The uneeded value must be causing the issue on the form.
Hope this help. Let us know if still not working.