Mostly poor grip technique.
There's other causes, too, but a weak contribution from the support hand will definitely do it.
Especially when the support hand loosens as the gun goes off.
A too tight of a grip from the shooting hand can do it regardless if you are shooting two handed or one handed.
It causes the trigger finger to stiffen and lock and push the gun off center when pulling the trigger.
Try to practice a strong grip that controls the pistol but still allows a flexible trigger finger.
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