Ive seen archers using exploits, its quite new, but its been around for at least a month now. I dont know how it works, but there's archers out there, that have an infinte stack of arrows. You can spot them easly. They got 1 arrow in there quiver, but can still shoot as much as they want.
This arrow bug thing needs to get fixed.. or at least changed. i guess people found a way to exploit it