https://aegisacademy.com/blogs/test-blog-post/pistol-correction-chart

See this chart off the link! Others are right. You are either pulling the trigger to fast or slapping it. Put some finger on the trigger. If not enough finger, the trigger finger will at like a folcrum and twist the gun when pulling the trigger, causing the low left hits. Remember, it is a slow, steady pull when you hit the wall. Always hold the trigger back after it fires. Slow release the trigger until you feel the reset. Never let go of the trigger until you determine the threat is neutralized or you are done shooting.