Can't add new server to collect event logs

I tried adding a new server called server2 (172.19.65.64) and it tells me its a duplicate so I can't add it. I searched over my servers and can't find any servers with the same name, but I did find a server listed with the same IP address. So I figured this was the problem. This server called server1 actually has an IP of 172.19.71.25 but use to have one called 172.19.65.64. For some reason Eventlog analyzer still shows it with the old IP and I don't see anyway to change it. When I check the logs for server1 they are correct so Eventlog Analyzer is obviously not using the wrong IP address. Does anyone know how I can change the IP address listed to an existing host? Or maybe there's something else going on I'm missing?

Thanks