Okay so i have been playing fallout new vegas and beat the game twice, the first time i was about to turn in "I put a spell on you" but the second time, after i defuse the bomb, i go up to Colonel Hsu to report that the bomb is disarmed and he responses with "what happened?" and it only gives me BS small talk dialogue, and no way to turn in the quest. does anyone else have the same problem? is it possible to fix?

I think you just have to wait till he gets into position. Then he will talk to you. I remember running up to the stage after disarming the bomb then running back to him to tell him the bomb was disarmed and then he does what he is supposed to do.