Thanks. It is indeed a SharePoint list form, and it has undergone numerous customizations. The first thing that strikes me is that this form has five views.
Since the data is showing up correctly in the SharePoint list, then the problem is the form. The form is probably not displaying the data as it is expected. Maybe some fields are in a different view. Maybe the user is not looking at the correct view.
I would suggest creating a debug view where you display all the available fields, and use this view to verify that the data is there. Once you can confirm this, then you can think about how the form template needs to be modified/customized to correctly show the data.