Your quests start, but the dialogue is not properly initialized. These quests are marked as 'start game enabled'. The gist of the problem is this: You have quests with dialogue. We all refer to it as the 'dialogue bug' and it's been a pretty big thorn in everyone's sides if you're making quest mods. So I probably don't need to tell everyone that since Patch 1.6 there have been some problems with creating quests that contain dialogue.