Ichigo, on my M22s the only thing visible through the port is the metal back plate of the tweeter. Every speaker of course has wires inside the enclosure leading from the crossover to the drivers, and I don't think that the exact location of them would affect the sound unless they were audibly vibrating against the metal. The exact reason for what you saw, if there is a reason and it wasn't just an assembly error, would be known only by Axiom.

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Enjoy the music, not the equipment.