Appearances are deceiving you have to look at it if the costume wasn't there. follow the contour of his leg the upper portion above the knee is right on and the knee joint seems ok what is making it look off somewhat might be the calf but looking at it I think it is accurate, it's just photographs can fool you into thinking he is shorter than he actually is.
Besides he isn't long legs sally, this is a buff dude and on muscle contest their legs look short because their upper body looks big. it's an optical illusion nothing more.