The first image is what I had been rendering (it's frame 36/255) and the second is what it changed to on frame 37/255. I have no idea how this happened and I can't find a way to fix it. (Cycles render btw)
Extra clarification: The colors aren't the 'texture not found' colors, they are just different, again it changed midway through the rendering process. The textures used are principle BSDF nodes with a change in the base color.