Puppet animations by sorting layers, generate overposition in prefab

Hello Everyone. Well i´m now with this great trubble in the prefab of my enemies, this is a vertical beat them all (like Zombie Smasher-Android App) with all the characters animated by puppet, but when i´ve created every enemy and want to instantiate since the prefab, some pieces that are in the same sorting layers, overlap between the characters when they cossed, like the eyes and hands, i think is a problem with the sprite renderer but even with the unity proyect 2d; this happens too. Maybe you can helpme and explain me how i can resolve this, because i´ve seen very much games with this mechanic and nothing´s wrong whit the parts of them characters. Thanks everyone.