Is this a bag?

Hello, I started almost playing WoW cataclysm, and now I have one question

I level Goblin Warior and I came to the Surrender of Else mission

And when I start the mission to me, the naked creatures do not appear on the yellow, but red (as enemies) and attack me, and I watched on youtube and saw everyone show me that they will not attack, and when I get there to their own boss I will not let him attack me

Is it a bug or?

I asked a Dev to check if out a couple of days ago, it is probably working now since it was an easy fix.