therev,
Yeah, if you check the deck leveling and the blade tips when pointing "sideways" are identical on each side and the front blade tip, when pointing towards the front/rear of the mower are lower than the back that is the "normal" deck leveling setting. When the blade tips, when pointing towards the front and back are lower in the back than the front that is referred to as "heeling" the deck and is considered to give a better quality cut, but requires more power. I "think" the rear tips, versus the front tips cutting the "final height" of the cut grass may also produce a striping effect but I don't know for sure.
P.S.
You know, after looking again, what I am seeing may very well be the "tire tracks" eluded to by user Carscw...not a striping effect. Still looks like a very good cut!!!