While purely cosmetic, Kruber holds his halberd and his spear as a left hander, which leaves him with his unarmored side facing towards the enemy and his armored side facing away, the opposite of all his other weapons. This makes no sense.
Edit: It should be added that in the character select screen Kruber holds the halberd correctly, facing the right way (the opposite of in game at the moment). Which is why I assume this is a bug and not necessarily a choice.