Chunks are clearing and rebuilding them selfs - NOT MINOR

What I expected to happen was...:
Chunks shouldnt be rebuilding them selfs.

What actually happened was...:
Chunks rebuild them selfs sometimes and this stuffs up my world. The chunk problem has only seemed to occur on single player so I play this world as a server. Happens once every say 10 times the world is loaded. Minecraft install has been cleared and problems persists.

I have a large city, im constantly restoring the world from a back up because of this.

Steps to Reproduce:
1. General world play.