I had sent in a few reports about this on test realm, but it seems it's carried over to live. Wizards look awkwardly placed on the horse and unicorn mounts. They look as if they are doing the splits almost. I have checked all other mounts, but the glitch only seems to be with the horse and unicorn mount. I suspect this "glitched look" is due to a change made for the new ram mounts.
This might be something for you to send in a ticket to Support. I realize that you've probably done so, and if you have, it's a matter of waiting until more people report it, then waiting until it gets its turn in the priority list of to-do things.