So, I asked Bandai directly and I received a reply
Unlike the Egyptian Gods, Wicked Gods, and Sacred Beasts, the Nordic Gods are different in size with each other
The information economy had collapsed long ago
TAHK0 speculated on why the error may have happened, writing, Poke Balls went through a lot of early variations, with everything from the button placement changing, to how it opens differing, to even being depicted with the white on top. It could be that an early Pok Ball design actually did open like it does on the card back, but when the design was eventually changed to the opposite way, they forgot to update it on the card back before going to print, and it remains that way to this day
By mastering the Sphere Grid, each of your creatures will level up with helpful new keyword abilities
Its cool seeing the various iterations in this vein