When scepters are sheathed by characters, the character’s right hand puts it on his left hip and the weapon position reflects that (the end of the scepter is pointed down, behind the character).
With Shard of the Deep, the end of the scepter is pointed up, and doesn’t look sheathed, it sticks way out the front (instead of the back of the character) in an awkward position
I realize this visual bug isn’t exactly a game breaker but it would be more visually pleasing if the Shard of the Deep was sheathed “correctly”