Spawn egg are meant to be sorted alphabetically, thus:
Spawn Cod must be placed after Spawn Chicken and before Spawn Cow
Spawn Puffer Fish must be placed after Spawn Polar Bear and after Spawn Rabbit
Spawn Salmon must be placed after Spawn Rabbit and before Spawn Sheep
Spawn Tropical Fish must be placed after Spawn Stray and before Spawn Turtle
(Correct me if I am wrong)
Phantom spawn egg is still in incorrect position in create inventory. It must be placed after parrot spawn egg and pig spawn egg.