Username and D-Pad Realms!

Every time I login to my Realms and then a few hours of playing, I quit MCPE then when I go back to MCPE, my username can't be changed and it changes to "game_difficulty" or " "!
And, my D-Pad goes back to default!

To make this bug happen, login to your Realms then tap on to
Click to Authenticate then it should say out-dated client!
But sometimes when this happens, no servers appear (That should happen)!
So, I exit MCPE and open the multitasking bar delete the history of my MCPE
Then, go back to MCPE and look at your Settings.

Please Fix This.