When a quest/quest combination has already been done, if the quest map produces one of these an inactive tile is produced. However, the one with Hainen the Fire Disciple can be repeated, and so can the one where you have to side with a mob or the disciples, but siding with the disciples produces a different result each time.
You need to prevent the Quest Map producing inactive Quest tiles, and add more quests. Maybe also change the Quest Map item to be associated with Wanderlust rather than Heroic - Heroic is already powerful enough as is, with Henchmen, double experience bonus for quests, +50 Influence and +1 Faction Prestige for completing a quest. It doesn't need to be able to create quests too. Plus, I think Wanderlust suits better for creating quests, because they are always wandering around and find quests that others miss.
Also guys, submit your quest ideas and hopefully Derek will use some of them!