My left grip panel shattered at the range today. It broke off in my hand at the first shot of the day. Now I have heard of this happening and that it is due to overtightening of the screw that holds the grips on, so I have been careful (so I thought) to not do that. But I am curious to know, if your grips have broken, did they do so like this?

It seems odd to me that it would fracture so far up; I would have thought that if it were overtightened that the extra force would be concentrated at the grip nut, and would cause a crack to form right at the screw hole. But maybe nothing is out of the ordinary here and I am looking for an explanation that I already have eh.