Oh dear lord how irritating is that. I do not see how anyone can be having problems unless they are fighting the wrong mobs.
People have problems because the mission is buggy, not because the mobs are 'wrong'! Just as the Alderaan bonus mission is buggy, you have to reset this mission sometimes in order for it to 'update'. As I said earlier, I have had to reset on all characters that have done this particular mission and while Ash may have a point up there about it happening when you log out this is definitely not the only culprit as I do it immediately I get the timer (i.e. take the mission) and it still has never worked first time for me.