The uneven light of kindle voyage.

Hi guys.

I got a 2nd hand voyage this morning. It looks perfectly new to me. But when I started setting up the account and everything, I notice that the color of light is not even. The light at the bottom is whiter and the top is a bit brownish.
I just wonder is it normal to Voyage? :blink:

Thanks.

[Image violates Posting Guidelines for size - MODERATOR]

Attached Thumbnails