How new are they? Are they relatively new Cisco Products? If so, maybe they have MIBs that are not in NPM yet or are different from other similar products. I have had similar trouble when I purchased new model switches in the past. Future updates may fix the problem.
There is a thread for similar unknown or mis-identified products you may want to add this thread to.
John is right, use Tell us your "Unknown" devices!
To fix the view now, edit the nodes and select "View Type" on node edit page. Don't select default, use "Node Detail" instead. When you select default it will come back to Wireless Controller.
I have this as well for my Nexus 56128s. It says "cisco" for machine type. I don't think it thinks mine are a wireless controller though. But UDT won't work on them.