Difference in Two Nautilus Minis

Hello. I bought two Nautilus Minis about 3 months apart. The difference is in the airflow. The first one I bought, when you take out the coil, has an open area underneath that tapers down. When you look through the airflow, all you see is light.
The second one, when you take out the coil you see a metal ring underneath. When you look through the airflow, you see the ring. The ring blocks about half of the airflow hole. It makes taking a drag a little harder.
When I entered the security codes, it said both were authentic. Was there a change to them recently? Can anyone explain this?
3264 x 1836 - 2M
3264 x 1836 - 1M
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