One user logged in, but appearing two times in Server Admin AFP connections view

Hi All, I'm wondering what does it mean that in Server Admin we see two identical network names being logged in at the same time. Server Admin counts them as different users so we usually divide this number by 2 to get the real amount of users connected via afp. I've seen this behaviour on Tiger and now Leopard Server and wonder if this could be a potential performance isse and if so, how to avoid it. The Xserve is connected to the network only via one Ethernet cable, en0. Thanks, Alex