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).

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