Sometimes, items get a bit bugged when you don't end/start the quest with them : some one use accessories don't refill for instance.
Try to have the talisman of power equiped both when you end the quest, and when you start the next one.
Definitely this. Items DON'T reset if you don't END the quest with them equipped. I tried doing this with the Chalice of Power and some other items, but found they were still at 0 uses when I began the next quest.