What you're seeing is completely normal. It will get even more pronounced over time. Leather is a natural material, and the way these seats are made, there is enough slack in the material to allow it to stretch and wrinkle naturally.
Saying it's not acceptable is like saying that it's not acceptable for the tread on your tires to wear over time....
Do you have any leather furniture at home? If so, you should notice that it does the same thing.
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I think it is bad luck to be superstitious
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