Field Group Not Wroking

Hi Forminator Team, I created a form and inserted “Field Group” – under which I created a number of fields. I clicked on “Preview” button, form was working fine. Then I published the form with “Publish” button, and checked again by clicking on “Preview” Button – form’s fields group did not work this time. (After publishing the form, field groups stop working.) Please suggest if I am missing something.

Thanks