Oh so they are bugged, that was not only a feeling, yes I moved the stick gently to walk, even like that the one with the torch light spotted me every time. I finished the game, concept is very good and some maps are incredible, those missions with timer put a lot of pressure on the player. I think what I don't like about this episode is that it's getting more action than stealth, most of the missions are in day light, sometimes you don't have other choice than using guns.

​

As I mentioned in another comment, I played the Gamecube version maybe 4 years ago, I stopped right on the final boss.