Horizontal lines in blue and gray areas topic

Hi,

Two weeks ago, I bought the Moto G. It is a great device. However I made a strange discovery.
When the brightness is high, there seem to be horizontal lines in blue and gray colors like the
facebook icon. You need to look very close to see them. When I looked at the display with a
magnifieng glass, every second line of pixels where in a lighter colour as the others.
All images are very sharp.but still the pixel-lines can be made out. If this is normal, then I will
live with this.

Thanks for any information