Yeah.. that's poor eye relief. It happens on (most) magnifying sites.
It means that you're basically magnifying the end of the tube by the direction you're looking.
I just make sure I have my head right next to it, keeps it centered.
Hated it at first, but you'll get used to it. Or you could buy an RDS.
Either way, good luck. Not a defect. Weird that it's a rough line though..
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