Some of your WPForms field values will happen to not match what you need to fill into PDF fields. Missmatching field values will cause some PDF fields to be unfilled, or filled with the wrong data. You will need to create value mappings to resolve such issues.
A new pdf template or edit 1 pdf is available
First, you need to select a contact form that needs mapping with the template and save it
Next, choose WPForms fields or Text to put in the template
In the shortcode section, select the field that needs mapping