Transparency issue when loading a new world, graphics glitch

Transparency, can see through blocks (can see underground caves from above ground), can see entities through blocks, water is also visible through blocks and the water texture behaves strangely.

 

Sheep textures are also glitched, as each individual wool texture (e.g limbs) overlap others (main body).

 

My file exceeds the maximum size limit... it is 1528.28 megabytes.