The Delete Dependant

So, I have been working on an awesome creative world, but once, I got into the game and it had been automatically deleted! However, the game will not let me even rename a survival world I have! This has happened twice, and I put a ton of work into the missing world! I am currently testing to see if it will delete one of my other survival worlds, and I would apprechiate it greatly if you'd fix the glitch.

-Your Loyal Fan,
Olivia