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What makes you think they are appearing as interfaces?Are you trying to view them via the 'Wireless' menu? If so, then what you are seeing is Thin APs as 'advertised' by their WLC. In other words, the WLC(s) have been added to SolarWinds as full SNMP readable nodes, and SolarWinds then queries the WLC for the list of APs on it.
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Now that is odd. We don't have an Extreme gear here so I can't compare - only got Cisco, Aruba, Meraki and Juniper APs and having checked they are appearing 'as expected.Possibly a quirk with the Extreme to SolarWinds interaction or even a bug. Probably time to open a ticket with support.
Open a ticket with support they will tell what is missing from the extreme to display the same info you get from Aruba & Cisco.
