Lead not generated on form submission

Lead not generated on form submission

We just launched our site and changed from the staging environment to live, and now form submissions are no longer generating leads.  I have tried everything listed on this similar help topic without success.  https://help.zoho.com/portal/en/kb/crm/faqs/sales-force-automation/lead-management/articles/why-are-leads-captured-through-web-forms-not-visible-under-leads-tab

When I go to the Reports section, the submissions show up here correctly, and the user gets confirmation when they click submit.  https://forms.zoho.com/username-here/home#myreportsAll

The fields are mapped correctly and nothing else has changed.

I'm simply putting the iframe code into a modal popup and it's been working fine for months on our staging environment.  I can't see anywhere in Zoho or within the iframe code where a hard link to our staging environment is specified but please advise where I can check for this.  Also note that test submissions from our staging site are now having the same problem, so I don't think it's a hard coded link causing the problem (not within Zoho anyway).