I've just started the game, so i don't know much about the story and many therefore this might all be something correct. Basically i went to Leurik to get the crypt key so i can enter the Crypts and get my amulet. Before even talking to him, i went and destroyed the chest in his house, retrieving the crypt key. Then i talked to him and agreed on the mini quest regarding killing the salamanders. Did that, and went back to him, and received a second key. I don't think there should be a duplicate of such important items, but i don't know, they might be 2 different separate keys that open 2 different crypts. This i don't know, but i wanted to inform the developers about it.
Here are two pictures showing the 2 crypt keys:
