Chunk corruption

When I had started up a New creative flat-world, it seems perfectly normal. I had noticed my render-distance was set to 12, so i increased it to 18. That is when this happened, some kind of odd chunk corruption that is duplicating a part of an NPC village in every chunk, but then duplicating another part in every chunk. This happens in both populated and unpopulated chunks, moving does not affect it. When i had rejoined the world, it was back to normal. This has also happened in other worlds.