I am unaware of why they are so darn glitchy but you can't ride them, it may be due to the major role they play in PvP? but i mean unless it's just a glitch that can't be fixed, please do something about it. make them work please. it's really the only decent rate reliable method to taming xp and it's pretty crappy to be thrown off the server before the horse decides to do it himself effectively restarting the entire taming process
the server kicks you off the horse, before the horse does. also riding a tamed and saddled horse, you're thrown off aswell