Default Wallpaper zooms in when home button is pressed

Hi all,

I recently just got my Z2 and when i try to set my wallpaper as a photo i took with the phone's camera, it keeps on zooming in. I tried taking photo with 1080p resolution, doesn't work.

Its all good when i set the wallpaper through the short cut (not setting), and it shows all fine until i press home button, and then it zooms in (looks like a glitch/bug).

Please help! Thank you.