He keeps going keeper's left, tats the issue. I prolly think he wants to generate power bcos of his favourite left foot. He know cant really tilt his body much because then the keeper will know, thats why he keeps blasting to the keeper's left.
He has always said he wants to go for power for penaltiies. But I think placement are equally important as well. His penalty against Chile also shows it's hard for him to maintain power plus placement, something Ronaldo would find easier due to his bigger stature and leg muscles.
Aguero and Neymar suffers frm it as well. No surprise they fall behind the best penalty takers of Europe.