Strange chunk errors created throughout world on 1.11.2

I have recently been playing again on a Minecraft survival world I had created a few months back, and just yesterday I came across something really odd. It wasn't anything new unfortunately because this has happened in several worlds I have played on, though I had no answer as to why this bug was occurring. Yesterday I was just mining and creating my own mineshaft, and so I logged off within the mineshaft. When I came on today, I was returning to my base when suddenly the path was blocked off. I knew I had mined through the ravine yesterday so I thought it had to be a chunk error, and so I was correct.

I then proceeded to mine through the chunk error and saw how it was very different to the rest of the surrounding area, in the video which I will link below, the cobblestone I had placed there as a path. Anyway I then proceeded to enter spectator mode just to see what else has happened throughout my world. I then witnessed a lot of chunk errors. Does anybody have an explanation as to what in the world is causing this to occur?

Video: https://youtu.be/X6vNyRkFvnY