Chunks glitching out and replacing previous chunks

My house is on layer 8 or so and when I walked up to the surface these chunks just sort of appeared. It hasn't destroyed any of my house yet but anywhere it pops up it deletes and replaces anything that is within the radius of the chunk all the way to bedrock. Started out with one or two chunks glitching out but now its slowly getting worse and worse, every time I head to the surface it seems a new chunk has appeared. Just a matter of time before it deletes half my house.