Games resets after I quit

I have a Alcatel Idol 4 device running android marshmallow 6.0

I upgrade my MCPE to the beta 1.2 then I downgraded back to 1.1 so I could play with no lag but when I quit the game, the game resets to default!
Even my skins, servers,Xbox (log in) and location of folder (external/application) are reset to factory (when I installed from google play). It did not happen before I upgraded to the beta. I am currently on MCPE 1.1.4!