Two Way Data binding on a form

Summary

Custom form not allowing two way binding on the State/Territory field

Content

We have a custom form where we capture information from a pending employee.  Since one of the things that can change from when the employee was a candidate to the time they fill out this form is the address, we have address fields like street address, city, state, and ZIP.  Everything but State can be set to two way binding.  So when an employee completes the form and have an address change, the state change is not allowed to be picked up.  Is this intentional functionality?  I know the I9 form works the same way because we have had several employees change their address between