Looking at the additional photos in the link attached to the OP, AD006 shows that the leather is crimped in the area that surrounds the trigger.
Since this holster is designed to be worn between the belt and body it developed a crush (or fold as described in the article) at the point where the trigger guard enters the holster due to insufficient stiffening at the open edge. Looking at the photo AD 004 you can see that the crush point slipped inside of the trigger guard and engaged the trigger when the owner holstered the gun while wearing the holster.
A couple of problems here as I see it (IMHO).
1, The holster was not stiff enough to maintain shape, whereby preventing this type of ND.
2, The gun was not completely holstered (ie seated fully into the holster in the first place) or it would have gone bang when the owner inserted the pistol.
3, I believe that the holster had been worn excessively without the pistol in it. This developed the crush and fold in the first place. Leather holsters rely on the firearm to maintain rigidity and shape, without the firearm inserted they are subject to crushing and deformation, more so if they are not stiffened. In fact most holsters come with a warning to not wear them without a pistol for specially this reason.
4, The belt used by the owner was the wrong width (Photo AD 007). Belts that don’t fill the belt loops only contribute to the stretching and loss of shape, not to mention that they slip around on the draw or active movement.
5, The owner is carrying a full sized gun in half a holster that is not constructed for EDC
6, Last but not least the holster is worn out, far past the point it should be carried.
Galco is not a cheap holster, but in my opinion they are not suitable for everyday usage long term. They are not built with suitable stiffeners at the mouth of the holster to maintain shape and hold the holster without crushing it closed when the pistol is drawn. The JAK Slide in particular is not an everyday holster but more suited to casual occasional CC. I have several slide type holsters, but rarely carry them.
This was owner failure..pure and simple, the guy was not paying attention to his gear. You have to wonder how long it had been in this condition.
I don’t need to run over and check my holsters, I check em everyday.