grass rows

I recently inherited a John Deere L-155 lawn tractor. I have a problem I hope you can help with.
When I am mowing the mower will sometime leave the grass uncut in the middle of the mower. This leave a rows of taller grass after I am done.
Could someone tell me what I am doing wrong, and how to correct it.
--
From: Raleigh, North Carolina

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keith nuttle wrote:

Mow in overlapping rows, and make sure the blade is sharp.
Chris Owens
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