while this seems to be some nerf for combat-mount attacks i also found this applied to me when being not mounted.
i fixed it by disabling my aspect and then logging off, logging on again (statpoints still gone) and then re-activating my aspect. then, the stats were there again.
confirm is dismounting and mounting armor shell do somethink with it
i can confirm only on p2p if your horse or other mounts do that if your on them, but never it's stay after dismounting
maybe armor shell auto-wearing ability cause that problem after you dismount a normal mount