actually, when I noticed this I started paying attention to the characters. when sev seems his shortest is when everyone is fully erect and standing tall. it gives the impression that you're playing as some kind of midget. but if you notice when the npcs are in their battle stance, they bend their knees a bit and become a bit shorter than the others who are standing tall. if you try to measure your height with them, you kind of see you're at eye level with them in that stance. it just appears he's shorter but he really isn't since you're not able to completely stand tall.