I guess because the grain has not been sealed with a protective lacquer it could absorb contaminants and get damaged by UV light. It does look really grimy but I would think your environment would have to be really filthy for that to start to happen and highly unlikely. Your surrounding leather would look significantly worse if it were a dirty environment and it doesn’t. That fact alone says it’s a defect.
Hopefully this is a one off manufacturing defect. I would file a warranty claim.
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