Bugged Dungeons

Dungeons appear to be having issues with either spawning everything needed to get past the dungeon phase, or spawning everything within the correct area. I’m not able to finish Dark Ravine in WT3, even after doing a dungeon reset because not enough Favored mobs are spawning. First run I cleared everything in the dungeon and after starting with 4 Favored to find, I killed three and the fourth doesn’t exist. Left the dungeon, reset, ran back in, same story. This time 3 starting for the goal, killed 2, last one isn’t around. Does anyone know if Blizz is aware of the dungeon issues?