I had this problem when I used this last year and never did find a way around it... Once the Quests have been completed by satisfying the lock requirements, we get a pop-up that says the Quest was completed, and then it returns to the first screen of that Quest instead of going back to the Quests tab. We're just using the decoder to input answers at this point (hoping to graduate to AR triggers soon...).
Is there a setting I am missing? Is this a bug? Help!