I've stolen things without being caught also. some kind of bug?

No. The OP is just really bad at it.

Even I, who never steals, accidentally pick-pocketed Preston yesterday and didn't get caught.

Needless to say, I reloaded. I can't have my "Holier than Thou" attitude besmirched.

Why whaT??? i have stealth the full armory on the BoS still base and they didnt find out. maybe is a bug on bunker hill