Just reiterating this because I've actually been there, done that, and actually still occasionally suffer from this, make sure your initial index of the pistol in your firing master grip is correct and in-line with your arm.
Yes, I've even had this happen with multiple different types of pistols on the same shooting day. If how you perceive gripping a pistol is correct, but is actually wrong, you'll consistently do it wrong.
Sent from mah smertfone using tapathingy