pokemon card basics Player's Guide: Types of Pokémon Cards Basic Pokémon (TCG) - Bulbapedia,
Description
It occurred because the sheet of cards was loaded into the texturing machine upside-down after the fronts and backs of the cards were printed normally
even though it would be illogical, this isn't that usual either

OK, I think maybe the back is more of a giveaway
If true, the move would make the retailer one of the single largest buyers of graded collectibles with nearly 3,000 potential retail locations in the United States for consumers to sell their cards

They can be placed face-down to serve as land, they can be placed face-up to serve as an action, knight, or building, or they can be discarded for in-game currency to pay for other cards you might need more

When you tilt a genuine card in the light, the holo effect will shift and shine in a specific, layered way
