Multiple Nether Portals

Making multiple Nether Portals are just all crazy. if you make 2 in the nether then they only go back to the one portal you already made. If you make 2 in the overworld, it out goes two one in the nether. If you break the nether portal in the overworld and move it then go through it you come back into a new portal that was close to the previous location, please fix!