Menu background on pocket edition

When I opened MC, sometimes the background of the main menu (1.11 pe) goes to the previous update background (1.10 pe). I don't know how this happens but when I restart MC I still have this problem (not all the time). It's not a big deal, but still a bug and still should at least be considered fixing. Also I am playing on an Android divide so some people who play MCPE might not have experienced this problem.