ARP poisoning EX8000 Nighthawk

After installing my EX8000 extender all went well-- it was set up thru my router, seemingly that went well. I moved to a different part of  the house, but on same floor as the router. Ever since I have installed this i continously get ARP Cache Poisoning attack and seemingly when i run my ESET scan of the "network" the extender is listed as having a network threat. thus the reason I think the IP 192 etc address shows up under the computer info in my ESET notification.  Since this was not a problem before, apparently it is becuase of this extender. My security catches it , but I want to find out how to solve this problem as i do not want my system exposed., I will also add that it is my personal laptop that seems to identify the threat. I do not get any notifications from my work laptop.