when i create a world its fine at first but when i try to recreate the world the graphics spas out

Put the summary of the bug you're having here
when i create a world its fine at first but when i try to recreate the world the graphics spas out
What I expected to happen was...:
Describe what you thought should happen here
i expected the world to recreate perfectly
What actually happened was...:
Describe what happened here
the chunk graphics spazzed out like heck
Steps to Reproduce:
1. first create a world in 1.9 or above
2. next exit world
3. then recreate world; when it load the chunks should spaz out