Has this happened to other people? Is this common? I'm not saying I am going back but its a definite surprise.
It happens with regularity to people with ambidextrous safeties. On John Farnum's advice, during one of his classes, I later had my Kimber CDP2's ambi safety replaced with a single safety.
It's not the safety on the inside next to the body that's the problem, it's the one on the outside.
Don't know if yours has the ambi safety or not, but if you do have a single safety that's reasonably firm, then it should never come off when secured in your holster.