A friend outside of SitePoint sent me the answer. I was trying to add a class to the button like I did on another job application last week.
Here is my friend's message:
"Did you figure it out? I was able to just set value="true" for the
hidden input (with name="wizard") and it worked."
I asked him how he knew to add this value. He said:
"Because form submissions send name/value pairs, such as from textboxes
and checkboxes... but also from hidden inputs."
So I went into Google Chrome Developer's Tools and added the value. It worked.
The thing is that although I cannot save the page on the recruiter's server, the change is temporarily live on DevTools.
Plan on seeing this routine ad nauseam on job sites. It is the new "You mis-spelled a word."