When I last left my survival world server, I disconnected whilst on my horse. At that time I was playing 13w37a. When I got on later, and had switched the server over to 13w37b, the game had duplicated and spawned in my horse again.
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
) here.
Okay, I attached it.

Nothing to see in the crash report.
But as long as no other reports of that kind come, resolved as cannot reproduce.