World Corruption/Scary Glitch

I was in vanilla making a Minecraft world to to put on my private server when it started lagging, i check how much allocated data I was using and it kept filling up then Minecraft crashed and I went back in and THIS MONSTROSITY HAPPENED (i took probably 50 screenshots.) this didn't occur if I was at 6 chunks or lower of viewing distance but this still was weird, it even occured in the inventory menu. Also the effects changed a bit if i changed the view distance.