Different lighting highlights the blue side's 8 to 6 being noticeably darker than the red's.
I believe this has been a consistent issue so far with your otherwise faithful bezel. I couldn't tell you the fix for it. But it is apparent, and it isn't a matter of perception or eye's playing tricks on people because of bright red vs. subdued blue.
Maybe taking a video rather than static image will help people see if the difference is not as bad as it seems. In a lot of static photos it is a stark difference that breaks the piece for many.