Horse Clone

I discovered a clone of a horse I have named with it's saddle, armor, and name on it. Even more strange was It was not where the last place I dismounted it. It is rideable and has the same stats as the original. When I closed the game and opened it again, the original horse I was riding was gone. I went to where I left the clone and it was still there. I rode back to where the original was supposed to be, but this time it was back.