Small Engines (Lawn Mowers, etc.): mower deck

Question
Eric, I have a Airens riding mower 42" cut twin blade. The question I have is when I cut the grass one side of the deck is either cutting the grass to short or just the opposite the other side is cutting to long in short it isn't even. The tires have equal pressure brand new blades the deck is level and clean so was the mower when I leveled the deck I have the deck pitched from front to back the blades are exactly the same under the deck I mean the edges match perfectly the blades are on correctly. The only thing I have not done is change the belt. What are you thoughtsd on this and Thank you Eric.   Mark Eric I have tried to compensate for this by tipping the deck to the long side and this still does not remedy the problem.

Answer
Can you park the mower on a level surface, sidewalk or garage, and use a tape measure to measure the deck height at each corner and measure both blade tips?  You might have to go in the side chute to measure the blade tips.

How old is the mower?  Was it ever dropped?  I've had some decks warp and also had a couple of mowers come off trailers or fall out of pick-up trucks and bend the deck.

Eric