Why is my background of application name turning black or green?

[AC Question]

why my background of application name is turn into black or green?

i have Samsung galaxy note 3 and which contains lollipop 5.0.i m facing with the graphics issues.sometimes my application background is turn into blue or black .i have official version of lollipop its not custom so plz suggest me that i can permanent remove the problem from my phone...