Stairs textures rendering incorrect

I was loading up Minecraft, the regular snapshot check I do had revealed that 14w33a was out, I loaded up 14w33a and began playing, when I got on, I started building a small boss arena, and the hallway I had made before was textured really weirdly, I checked if I had a resource pack on, I didn't by the way. The stairs had just randomly turned from the regular texture to these weird things.