(Not sure if this is an issue with 0.7.2 as the update hasnt come out on Kindle yet) (but no one has reported anything like this)

For Weeks ive played on Survival Mode, and just recently im not sure how but my world was deleted?? then i saw a new world called creative (last played a long time ago) i clicked on this world and it was my survival world that disappered ? i played it only a few hours ago before hand and on the MCPE you cant change modes after creation, this is quite irriating as now ive got to start a new survival world after spending so much time to gather resources

What I expected to happen was...:
...

What actually happened was...:
World was deleted and recreated in creative mode? with last play date saying a long time ago. even tho it was 3 hours ago i last played it

Steps to Reproduce:
Dont no how to reproduce all i know is i was in survival my kindle battery died i recharged it then the world was gone =/