Are you referring to how there is forward momentum imparted to the horse after a turn? If so, as far as I can tell, this only happens on official servers. I don’t know what the difference is that causes it, but in singleplayer and online private, my horse always worked fine. It was only on the official server (testlive, in my case) that it happened.
https://forums.funcom.com/t/horse-momentum-on-official-servers/131137/2