form setting bdm to empty

business data object getting set with empty values

I have a form with 10 fields which gets opened up when I click "Run" in Studio (Bonita 7.2.0). A user fills this form and submits. When I see the form in form editor, the "value" field carries values like "formInput.applicantBdmInput.firstName", "formInput.applicantBdmInput.lastName" etc.