Not a response to any pictures shown here, but I hint from the last comment that infringements on the kneeling positions. I had seen at least two top shooters who are in the shake up most GP with their back of their hand sat on the knee. The only part of their hand that protruded out over the knee were their fingers. (Unless I'm missing the point)
There's a way to cure it make all position shots standing. Marshals have a tough job without keeping an eye on the problems.
I would not say that any of the things I had seen were intentional and perhaps over time this has happened.
I'm never going to be a top shot but I feel for the guys playing the game and maybe missing targets that others are getting.