i tested with watter and force carbonation and i dont smell nothing so right now i m clue less about the problem because the beer was fine a few days ago and now its extra bitter.
The only used parts on my kegerator are the kegs, and i have like one year experience and the IPA its the 5th i made the same recepie, thanks all you guys for your help, i m going crazy i m a newbie using kegs :(