What is filling in my noderole?

I have about 60 APC UPSs with the same OID being identified as a 'switch' instead of 'netdevice'. 

Their noderole has 'ups', and 'lan_switch'. I'm guessing somewhere down the line, 'lan_switch' is causing the CI to be classified as a switch. Or is it something else?

I see in the Normalization rules where 'ups' is being added but have no idea where lan_switch is coming from. 

I don't see an entry in the Normalization rules or ruleEngine/oidToHostClass.xml that would be adding 'lan_switch' to the noderole. Where else can I look to track this down?