My submissions unanswered questions are not showing up in the PDF format.

Once a submission is completed, i have to change the format into PDF but if there is a answer left unanswered then it does not show up in the submission. This leaves questions out even if they are unanswered.

How can i get these unanswered questions in the submissions to be able to print it out and see the question left unanswered.

In the settings for your PDF in the submission sections, you need to disable the  'Auto Hide Empty Fields' this will allow empty fields to show up in the PDF