Name Resolution on Device add is problematic

When adding a device, I will enter the name of the machine.

IPMonitor always finds it, and has a list of monitors I can add, but at times it will substitute the DOMAIN name for the device name.  For example:

I enter:   SERVERNAME (the server is in a domain, so it is actually SERVER.DOMAIN.FOREST.COM, but i do not put in this FQDN)

it returns simply DOMAIN as the device name.

I can fix this by changing it again before I go into the list of monitors and select them, but do we know why this happens?