It's arguably the most famous Five Color card ever printed
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
KMC is best known in the Magic community as a brand for their Perfect Fit inner sleeves and Hyper Mat variants, especially useful if you're attempting to double sleeve your decks
A wider-ranging update to both the Trainer Card Maker and the website itself are both in the early stages of development
How to vet a supplier and avoid fakes and grey-market product Counterfeit and resealed Pokmon product is a real problem, and a bad batch can wipe out your margin and your reputation