All As Tile Entities In My World Are Disappearing!

Hello! My MCPE That Bugging as a Mosaic Entity of My World, That summarizes everything that is within the limits, the commands within the commands Blocks are summarizing, The boards that were before Now there are not! it is as if you had erasing things! Like If I put an item in the cloud after a while in the cloud it is empty! if I put a Commando command block inside after a while or add command and the command block is empty! Happens to all like Tile-Entity, Chests - Mouduras - Plates - etc., Please Help Me.