Thanks again, everyone, for your reports and screenshots, it has been helpful. The Mirror of Glamering is not working correctly with older randomly-generated armors. Please do not use the Mirror of Glamering on older randomly-generated armors while we work to fix this issue. We've now added this to the Known Issues list. New armors (say, anything in the past year or two), and named armors, should not be experiencing any further issues after today's hotfix.