@Trevelyan Do you mind hitting me up through chat?
I think I know a fix. My guess all of the systems have a VM system installed on them? Because of the imaging process, they all have the exact same NICs for the VM system. What I’d recommend is to set the two macs on the filter list so those two macs don’t get added/readded through subsequent registers.
This meaning, add the two 00:50:56 (you should be okay with just that much of the mac added to the filter, approve these two nics and delete them after approving them.
They should no longer continue to register (hopefully if SVN is working properly) and all your other hosts should (if using the new client) register themselves into a pending state, or do nothing at all because there’s no mac address associated with a host.