horses duplicated

I'created a game alone, found horses and adopted one of them then I opened the LAN game. No bug for moment.

But after leaving my game and came again, my horse has been duplicated !

Surprised ! I tried again. I get on my horse, i open the game in lan, i close, I come back and and my horse is always duplicated.

1. I found a horse
2. I put a saddle
3. I'm on a horse
4. I run the game in lan
5. I close the game
6. I restart the game
7. My Horse is duplicated !

Sorry if my english is little bad, i'm french

I hope I have helped, I have not seen for about.