bringing the candle from the dark world is not a bad idea since the whole idea about the candle or hammer decision was to be a upgrade but give or take however you see it but, since I have never thought to do that nor thought the player would do said action I wouldn't call it a bug but if you were able to beat the dungeon I see no problems there.
There was a choice? I was able to take both the gray candle and the steel hammer. Maybe that's a bug?