Limp wrist or better yet: Sort of a flinch at the time of pulling the trigger.
One of the reason's I recommend gripping a ball the way I did. Sort of a push it, pull it, problem for some. If the trigger pull is light I have found it to be much less of a problem. Seems the heavier the trigger pull the more some seem to have the problem that appears to be not enough backing for the gun for recoil situation.
You can see it even with a two hand hold. So there is more to it than just holding the gun. It seems. Many times that second hand causes problems. So then you have to go to a single hold and work it out.
Persons who push with the left and pull with the right are going to be having some horrible groups
In the Glock there are many springs available for various reasons, some times it is necessary to check that area out.
The lighter bullets are suspect also. The range of ammo from 180 to an area of the light Frag ammo shows that to be a major contributor to some problems that look one way, but are another one totally.
Lumbering bullets vs the fast light ones is what I am talking about. In the 22 rimfire, the weight of the bullet is very important for proper function of the slide. (velocity also as much as little as 4 grains is a culpret), in 22's that is only 10% not like some of the ammo out there where the pistol should operate with a varience of much more than that (weight of bullet).
The ammo for a 45 and 9mm (war ammo) that were recommended never to be changed. When you did all sorts of problems and gunsmithing needed to be done for the want of a different bullet.