Design Issue [ design is not coming properly in mobile app]


I am facing lot of design issue in mobile .
In some the mobile its coming properly and in some the mobile its not coming properly .
so anyone tell me why its happening like that.
wherever mobile action button is inside the mobile screen there its not coming properly.
and wherever mobile action button is outside from screen [bottom of the screen] in that mobie design is coming properly.

So please help me out from this problem.