It's tough to see from the photos, but it's not the light reflection - in Kal-El's first and second photo you can see the belt is slightly white. In person it's noticeable. Although the third photo has a significant amount of reflection, the first portion of the belt (from the left) has no glare and you can see it pretty clearly there as well.
I just found it odd when I first took mine out, doesn't bother me though - just wanted to give you a response