I just walked into the fm and jumped to my prefered fm-hoe spot when I noticed this If you look closely you can see my character standing behind the mount and when I talk the chatbox appears as if I am standing When I walk around my character's sprite flicks (each frame?) between standing and being mounted. My friend didn't seem to see anything different on her client. I guess it was only visible on my client. Entering a new area removed the glitch.