When running the "asadmin validate-multicast" command, there can be duplicate entries shown so that a host shows up more than once. For instance:
Received data from myhost (loopback)
Received data from someotherhost
Received data from myhost
'myhost' appears twice, when it should only be there once. This is a minor issue, and is due to a bug in the gms code that does not clear out the data buffer between receive() calls on the socket. If you run the tool with the --verbose option, you can see the full messages that are being received that cause the duplicate entries.
What's important is that the host name shows up at all, not how many times it shows up. But this could cause confusion with users (it confused me).