I am getting chunk errors in my 1.8.1 world (default world generation and structures are on).

The chunk error looks like a different terrain generation than the surrounding biome. I have gotten a few in what I believe were previously unloaded areas; but now I have gotten a few where I had just loaded the area ~10 minutes earlier.

P.S. In the 2015-01-01_12.08.49.png screenshot (the desert one), I was at the spot ~10 minutes prior with no chunk error.

P.P.S. The horse in the 2015-01-01_12.08.49.png screenshot (the desert one) is the one I am currently riding. Somehow my horse got duplicated.