Changed Worlds

Opening the game, I was going to edit one of my worlds. It was basically a replica of the map "Redstone Mansion" from the store, however, once I pressed on the world, the game crashed. I did the same process again, this time, it worked, however, it wasn't that world. It was the same seed however, all the things I created were gone. This has happened before several times and it has reached the level where I am sick of it. Please fix this bug as to us players, it could remove our most precious of worlds.