zfd7ir2hp1 on netware 6.5sp6.

We are in the process of renaming our workstation objects, so I created a
report listing the workstation name along with the zenwmMACAddress attibute
and am finding some workstations with several zenwmMACAddress listed. Some
are ligitimate with Vmware, but I have some workstations with as may as 30
MAC addresses listed. Any ideas what would cause this?