CNA shows device as "Wireless Client" when it's not

[disturbedone]

For the first time in a while I used CNA 5.6 and it showed a recently installed 2960S had an 'unknown device' attached to it and it had a long, what appeared to be a, serial number. I thought this was odd so I upgraded to CNA 6.1 and it now shows the long serial number but it shows it as a 'wireless client'. I do have a non-Cisco WiFi controller attached to this switch so I thought somehow it might have detected this. But clicking on this device shows that it has Device Type as PCM6348, an IP address and the hostname is the long serial number. I recognised the PCM6348 & IP address as the Dell switch that is in the Dell M1000e blade chassis to which the 2960S is connected, the serial number is the serial number of that 6348 switch.

Any ideas why CNA would be detecting a Dell switch as a 'wirelesss client'?