Newbie question: weirdness when binding clients to OD replica

Hello, I am experiencing what looks like something weird to me, but maybe I am missing something relevant here... If I (secure) bind a Mac client to its OD master server, everyhting seems fine. When I do the same using its closest OD replica instead, after successfully joining the server, when I open WorkGroup Manager I now see three entries/records for this one client within the computer list. They very much look like the record names I usually see together within the "Inspector" window for each client bound to OD master but it looks like there are 3 computers being added to WGM list. One is the actual computer name, the second is its FQDN and third is LKDCxxxxxxxx Why is that I have 3 entries instead of one in the computer list? Many thanks for your help! Ciao Carlo