Submitted form not complete

When a member filled out the membership form, only the Submission Date and Signature is shown in the PDF version, and in our Google Spreadsheet, there is a line for the submission but the entire line is blank.  Only the submission date and time and signatuer is shown.  When I go to Edit Submission, the entire form is empty except for the signature.

Do you know how this person was able to submit the form when we have "Required" fields?

Here is the link to the form that was filled in:  

http://www.jotformpro.com/edit/366090846422973173

I cloned the form and tested it by submitting the form.

I could not replicate the issue at my end. The pdf attachment showed all the values along with the signature

Submitted data also showed all the values in submission.