My brother spotted this the other day. It seems certain key quest givers will auto accept quests for you but while watching him to talk to several people and abandon and recollect quests on his new character it doesn't seem to re-occur.
Also, we noticed that any character already in existence, even at a lower level doesn't get the same effect. But that could have been pure chance that the NPC he talked to was one that doesn't auto accept quests for you.
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