So I hit level 20 last night and want to start the quests to get my mount but realize I haven't progressed far enough into my story. I do a couple of duty instances and log off for the night at almost level 21. I log in today to do another duty instance and level. Then I look down and find out that I have started level 20 over again instead of leveling to 21. Can you not progress past 20 until you finish this part of the story?