Default [Q] Strange Lockscreen Graphical Bug

So I've had this strange occurence ever since the 4.4 update and can't seem to fix it. Has anybody else had this and/or been able to fix it?

http://imgur.com/2Q5qLaF

I refer to the distinct change in shadow transparency/colour near the bottom just under the clock. It happens with every wallpaper.

I should add I did a factory reset earlier, which did nothing but make me reinstall everything.
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