Playing MCPE like normal started a new world and I left the app and went straight back in to it. Then I went into settings  immediately to change the render distance from 9 to 8, to reduce Frame drop. Exit from settings and resume game just to see this.(Look at photos) and of course exiting out of the game fix it.

Also another thing that has happened to me 3 times now is this screen glitch. It just rapidly flashes at me. This seems to happen wen I try to save and quit. I tried to record it but the file to big it try to resume the game and at the end I somehow made two new worlds in a world. I have the video it 20.83 MB.