I've noticed it doing this since I got it last year, but haven't really had time to look at it. Its almost like a blade or something is bent as it's cutting ledges in the grass. I've used the included deck leveling gauge and it didn't seem to help any. What do you guys think?
Your lines look pretty uniform. Any chance you've actually measured the distance between them?
I'd think if you had a bent blade you wouldn't end up with nice straight lines like that. Is it possible that a tire is bending the grass down and you aren't getting enough suction/lift from your blade to stand it back up and cut it off? It may come back up on it's own after a few minutes....
My brand new 530 did the same thing the deck spindles were misaligned ie not parallel from the factory ..cut a stepped lawn and it looked like crap...tried to explain to my local dealer whose service tech stands in as the village idiot..(don't get me started)..ended up removing the deck and spending a half a day realigning the spindles myself (it involves metal work)and it cut's a putting green lawn now..that said I suggest getting a new replacement deck if you can ..under warranty