Misprint or counterfeit?

I purchased this grass energy on eBay. It’s back side is backwards and I’m not sure if it’s a fake or a misprint. It’s from the HeartGold/SoulSilver expansion and its looks are consistent with other cards from the set except the reversed back of course.

-good quality print
-good quality paper

-border looks thin
-I haven’t seen any other cards like this, even with research, and I figured there would be more since they’re typically printed in sheets.

Thank you!

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