Collection Perfomance counters

That's right @Mike Moniz. What's likely going on here is that the set of user credentials used to run your collector doesn't have permission to do WMI queries on those servers and/or you don't have WMI credentials added as properties on the parent group containing those servers. Either way, what you know is this: LM thinks those servers are windows servers based on the open ports, however, when the collector tries to query via WMI, it's not successful.