You are right. As soon as a new device connects i can see a "ARP Attack" message popup but funnily enough it did not do so when i connected first 2 devices which were Wife's PC and and iPhone. So got 4 popup message each time i connected my media PC, Galaxy Tablet, and iPad.
But XARP went crazy when i connected my PC so i guess there is something in my PC so i will reformat it and see how i go.
I have changed the router and i am using my old Dlink DIR-635 for the time being.
Both ESET & Sophos have not given any warning about ARP attack so i guess everything is good. Big Thanks to you and Marcos.🙏🙏