This is under normal live firing yes? There should be no way for the trigger to spring forward on it's own unless forced forward by the slide's cycling. Slide cycles, the tab under the Striker moves with it, contacts and pushes forward the entire trigger assembly from the very rear of the Reset Bar.
Sounds like normal Striker Fired behavior to me, these guns' triggers work differently than hammer fired guns or anything with a second strike capability. If your not used to this behavior it can seem weird or wrong.
Correct me if I'm misunderstanding your problem.
Josh