Kobo Glo Blotches ('is this normal?')

Hey Everyone,

First post and first kindle here!

I have noticed some unevenness with the light (not the shadows at the bottom), but some areas of the screen seem to be blotchy.



You can see the top of the screen is yellowish, while the bottom is more white, and in-between in the middle, it is kind of blotchy.

Is this normal?

Thanks!