Ninja looting.

Hi! I think I have been banned for no reason. I tank dungeon as a warrior. When we killed last boss in HoL , 2h axe dropped. I really need this weapon for pvp reason to play. I will use this item. Why can't I need on it? It ruins my experience as a player of pvp server. Even if I should be banned for that, I consider 5 days ban is way too harsh for something I did on Reason.

Ninja looting is precisely that. You needed a DPS weapon as a tank and possibly took it away from other DPS that needed it or took away the chance of getting gold/enchanting materials from others who had the same right to it as you did. If you want that weapon, play a Arms or Fury in dungeons - then you'll have the right to need it. Protection warriors don't need 2H weapons.
I suggest you read the rules on your time off: http://forum.warmane.com/forumdisplay.php?f=3