The expected behaviour is for ResBook to receive these bookings as a booking request on already-confirmed dates.
ResBook will not stop the potentiality of customers making a booking request on already confirmed dates.
The ResBook user has the opportunity to accept or decline the booking request and go back to the customer for other room types that they can offer.
If a Temporary booking has occurred on dates that are not available, there are several reasons for the occurrence. An explanation to this is found here.