DISABLE Zed game changing bug, all ability doing 2x damage

Hi, first of all I'm not english and very sorry but this bug had to be posted ASAP this is gamebreaking. Zed can randomly has all his abilitie doing 2x the amount of damage (Showed on the picture you can find on this link http://postimg.org/image/a1l9zvy19/ ). Its ridiculous.

How to reproduce, go in a custom game against bot, put your clone, spam ability and every 2 ability you will do 2x the amount of damage.

Your Q can do 1200 damage from a single shuriken. E can do 1100 damage, the ultimate base damage go up to 1200!!! Just put your clone and spam ability.

MAybe this is intended and I overreact but this is completly overkill stats... During the game I bougt hunter and corrupted potion.

Edit: The bug doesnt seem to work on low level or everytime. But once you can make it happen once you can do it over and over. I'm trying to figure out what make it happen. Once you get the bug you can reproduce easy by using clone + ability. How to get there I'm still trying to see what I did to make it happen

Edit2: I forgot to said printscreen where made during the game it was a custom game. I was just testing stuff with zed while watching lcs when that thing randomly happen

Edit3: I think I find it Higher in level your clone is the higher the bonus AD will be. to see the bug you need the bonus AD to scale. The bug come from the scaling of AD in W. When you put a clone down it double the AD it give. It appear to happen randomly. First time I saw this hapening it was a recurrent bug during the game. The next try it happen a couple of time and the scaling was less. I'm still trying to get that double damage to happen again.