AX4-5i Cannot Remove Host

I have an iSCSI windows 2003 host and a esxi 4 host both connected to an AX4-5i that I cannot remove from the hosts section of Navisphere.  I rebuilt the servers, for different reasons, and added them back to Navisphere okay, but now they are showing up weird in Navisphere.  I have manually de-registered them under Storage- Connectivity Status, but they are still listed under the Hosts tab.  As a note, I did not de-register either host when I was re-installing the OS's.  (didn't realize I needed to at the time) I can't find any feature within the Hosts tab to remove them.  When I right click the host and select Update Now they return a successful message but doesn't go away.