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It appears that the cards have different card backs compared to the standard backs seen on Pokemon TCG cards

Guardian Sphinx Earth/Rock/5 stars/ATK 1700/DEF 2400 You can flip this card into face-down Defense Position once per turn during your Main Phase

Last Turn Activate Loading

(Nitz even speculates that he may have been the one to unintentionally let this error slip by!) According to Nitz, while this variant is colloquially named the Ghost Stamp error, the design element printed on these cards is, in fact, an artifact of the printing process known as a trap. Essentially, traps are used in offset printing to make sure that slight variations in registration do not affect the overall look of the print itself by overlapping some of the colors