Biome Problem on Flat World

My flat world has this biome problem wherein most of the grasslands in my map have different biomes. I am specifically concerned about the Taiga biome one which causes to snow in random block patches, and it looks horrible and gets in the way of my building. I can't find a workaround for this.

Here's an image. The bug tracker won't upload images for some reason :/
http://imgur.com/a/6fkXG

This occured at around the 0.16.0 beta testings.

P.S. It only occurs in one of my worlds, the only one I opened during the 0.16 beta testing. It also happens on most oarts of my map, not all, aparrently