I have a form set up in the old responsive version. I am running Nintex for Office 365. The form suddenly developed a problem with date picker field. It no longer shows the calendar in the corner and behaves like a text field. I have a rule set up throughout the form to make some date fields mandatory if another field is populated. The rule doesn't recognise date input in the field so it is not possible to save the form. The form was working fine for over a year before it has just developed the problem when I made some changes to other areas in the form and published an updated version. Please see attached document with images showing date fields before and after the error developed.

Please help!