i have had this problem before when killing/moving/clicking too fast in other global events..seems like it might be the same problem when attacking a player in GvG too fast when the page is loading and the pop notification says 'they aren't in your pvp range etc etc'(don't know if that pvp hiccup is still around) but you could hit the attack button again and it would be fine.can you walk up 2 tiles and see if you can accidentally attack the elite just using the number keys? also if i press 12345 too quickly it brings up the page to attack another player if a player is on the square with me.
Sure. Not happening. The Elite is not being targeted by the quick kill keys.
internet connection/computer hardware power could have some type of effect on this but who knows.