I also had this happen, it happened when I lowered settings rather than raising them though.

I had the same issue only the amount of graphical distortion was worse, it looked like the backpack was in the scope.

I had this happen as well, it launched me off the rough after my character started the animation to climb down and then I was teleported back to the top dead.

This is the only ladder where this has happened for me, it was also the only time I was in third person climbing a ladder though.