Hi William

1. Ensure you have mapped the process to the correct form. Try running the form by itself without a process to check the display is correct and all the fields are there.
    
2. Use "embed=true" at the end of the url in your iframe to auto hide the header, footer and side menu. Example: http://localhost:8080/jw/web/userview/test/v/_/test_crud?_mode=add&embed=true
   
    
3. Map your Run Process (the starting green circle) to a form (and not an activity to a form after the green circle). Run Process is a special activity that is mapped to a form. User will see this form before the actual start of the process. The process will only start if the user submits the form. This is particularly useful to reduce unnecessary creation of process instances. Read more in Joget Knowledge Base.

Matthew King, I was actually wondering what the benefit of having the Start form is in normal circumstances but now it makes sense why some of my processes go straight to the task inbox and others don't unless the first form is submitted. ;) Thanks!

Turns out it was a mixed content browser issue. I already had a certificate on the external form server but need to include https in the URL.