I have such a problem but it turned out to be my SD card was faulty. I bought a new card from SanDisk working great now. Same situation to the worlds. I downloaded an app on Google Play called Inventory Editior which allows you to change back to Survival mode and rename it. Some people said it was a cheat, but I think using it in good deed doesn't count. Most importntly is whether you want to play the game sseriously. Hope this helps.
Jason Chiu
MCPE-5485
This happened on a Android device, to be specific: Alcatel onetouch Sapphire 2
Isn't that normal? :S
I have such a problem but it turned out to be my SD card was faulty. I bought a new card from SanDisk working great now. Same situation to the worlds. I downloaded an app on Google Play called Inventory Editior which allows you to change back to Survival mode and rename it. Some people said it was a cheat, but I think using it in good deed doesn't count. Most importntly is whether you want to play the game sseriously. Hope this helps.