Loading of world glitch out

Opened a world created in 1.7.10 and all was fine at 1st until I change the render distance and difficulty. The loading of the map started going crazy, flashing like crazy and showing all the things that are suppose to be below me at the different levels. The picture shows one of the layer. Caves were also shown even to about y=15. I opened the map in 14w30c and there wasn't this issue