The default behavior of a VBR data collection is to take any host name it receives that is not know, and do a forward and reverse (IP to hostname) lookup. The setting is called, "Discoverd Hosts - Name Qualification Options" under the VBR agent module setup and is set to "Via DNS". If you want this to stop, you can change this to "Do Not Qualify". The lookup is done on the machine where the VBR agent is running. This can cause some issues if you are collecting remotely and the VBR agent host can not do the forward and reverse lookup. This seemingly happens more frequently for Windows backup clients.
You most likely need to follow this change with a host merge AND alias step. Please remember that merging and aliasing critical hosts, VBR server, VBR agent hosts, and backup servers should be done with the help of support. It is important which host object is the final destination.
Tony
