I have created some custom mounts, by following guides to copy over a saddle node to the skeleton of various creatures (bears, deer, etc.) I have created a custom race for my mounts and mapped their skeleton to the new mountable version, and given their actor the IsHorse (or whatever it is that horses have) keyword.

The problem I am having is that after mounting, the player will wait a second then immediately dismount. I have tried this with skeletons from other mods to verify I didn't just mess something up copying the saddle node over, and I get the same thing.

Anyone know what might be going wrong?