[CLIENT] Wrong disenchant number in Legendary skin permanents.

I got today a Legendary Primetime Draven skin as permanent skin via reroll. The problem is when i hover my mouse over the permanent it says i can disenchant it for 488 orange essence, but this is wrong! For a legendary permanent skin you should get 910 orange essence. (don't get me wrong i dont want to disenchant it, i just found a bug) :) Source: http://leagueoflegends.wikia.com/wiki/Hextech_Crafting