the chart above says the same thing...my guess is you're jerking/slapping the trigger. sometimes, that's done in anticipation of recoil...
a test..dry fire, focus on the sight. see where it starts on trigger pull and where it ends...also, buy some snap caps/dummy rounds. load them randomly in a magazine, but never the first round. see how you shoot, and what happens when you land on the dummy. having another pair of eyes behind you doesn't hurt.
a smooth, consistant, straight rearward pull is what is required. slow down your shooting until you see that you are hitting POA, then speed back up.