Adjusting the stance is a really good suggestion. But that doesn't always work for me and I think that it could have to do with the target grip that's on my gun. It needs to have the proper fit so that adequate pressure can be applied to the right locations. So what I sometimes do is to cant the pistol slightly to the right so that when I release the trigger, the pull of gravity helps to offset my tendency to push the shot to the left.
That does work for me but it's not always easy to keep the gun canted at the proper angle for it work perfectly at all times.
So like most shooting errors, hitting left could be caused by a combination of factors.