DNS names not updating in IPSLA operations

I wish I could show a screen shot, but it has real hostnames in it so I'll have to try and describe.  I hope you'll understand.

I have setup some IPSLA operations within VQNM and they added and data shows up, so I'm happy with that part.  However, my OCD is honking about the 'operations descriptions'.  In some cases there are no hostnames, just IPs and in others there's a name that comes from where I do not know.  Can anyone help me determine where the device names come from or what sequence is used to determine device names vs IP addresses?  I'm at a loss to how to fix this.