Look at how much is lost regarding leaves.....stems when the bales comes out of the chamber ! At least 15% left in the field ! Bale hay wet...........cut it and wrap it the same day. Almost nothing lost !
Either a very heavy crop or several thinner rows combined so that fewer passes with baler required. Probably not much tension so that the bales are not so dense that they can't 'breathe' properly and cause potential heating of the bales in the barn if the crop is still slightly damp. Just a guess mind you. Never even noticed how little tension was on the bales till you pointed it out - good spot !