Lost my stuff from world turning to " creative"

Hello my world turned to creative even though it was survival.
I have no ideal what happend and I want to change it back.
I have proof because
•when I break a chest there is still stuff in it
•my sister who plays the game still has her diamond armor
•I can still get killed evan thought I have infinite stuff
•I have my old diamond tools that are used
•I can't kill my sister even though she can kill me
•my worlds name is now blank
•the gamemode changed to creative

Please tell me how to do this! I'm on IOS 7 on my ipad 2
This update is now 0.9.4
And I really want my world back because I Worlde really hard on getting this stuff and I lost some of them and I'm afraid I will loose all my hard work on the diamond armor to the tools to the big two story house with a cool basement!

Message me if you want to see more postures of the evidence thank you