Invoices Form - Terms Date field, Date Invoice Received field

I am perplexed...we have many sets of books. They each represents a Federal Agency - each an entity of its own.

In Payables Options Setup, on the Supplier Tab, they all have Terms Date Basis = Invoice Received.

And yet, when I enter an invoice, they all behaved differently.... In one SOB, the Date Invoice Received field will automatically populate with the value from Terms Date field... and vice versa...

But this is not happening in all SOBs - in some of the SOBs, when I enter a value in Terms Date field, the Date Invoice Received field is not populating - it remains blank....