Hi,
We did spend several hours to review our websites, all plugins, themes but it was a Formidable Abandonment addon issue.
When the add-on is enabled: multi-step forms no longer work, clicking on "next" triggers the form completion action, which means displaying a message or sending an email according to the settings.
When the add-on is not enabled: the forms work normally, clicking on "next" redirects to page 2, etc.
How to fix it ?
Thanks