"Modern operating systems use a number of tracking prevention methods that can resemble the behaviour of many hosts behind a single NAT IP. Therefore NAT detection may also cause alerts for legitimate traffic that may not be related to NAT.
It is recommended to tune the alert frequency to a suitable value for your network, then investigate to determine whether further action should be taken."
So, it might be real, might be false positive...and we're supposed to go investigate them all? I'm not sure this is very helpful.