Can anyone tell me why my scag cuts like this (pics)

Hi guys,

I cut this lawn and am obviously not happy with the cut. I have a scag turf tiger 61'' with a 27hp kohler. The cut going away does not look horrible, but the return cut coming back leaves a nasty discolored line on the right side. I have noticed that the left side is developing one as well as you can see in the picture. Please help me get this sorted out!!

Thanks in advance, Brian.

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