Judging by the bending of some of the material in the 2nd pic, I’m guessing this person thought it would be bad for the material to be bent under their stacked weight if the tailgate was up so decided to lay them flat, completely ignoring the need to further secure the load because they were heavy.
Judging by the bending of some of the material in the 2nd pic, I’m guessing this person thought it would be bad for the material to be bent under their stacked weight if the tailgate was up so decided to lay them flat, completely ignoring the need to further secure the load because they were heavy.