Elder Scrolls 4: Oblivion Discussion
You're right about the glitch inside of the glitch, but it's not a jewelry item, it's a plant, so when he duped it, it made that plant have the permanent effect of night-eye. And since you ate it with the permanent effect on, there's no way to get rid of it except for to load your game before you ate it. I hope you didn't save after, or you'll just have to live with it.
Or start over. That would suck.
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