I like to put away the game carefully after finishing a campaign and check that everything is there. I could only find two Electrostatic Discharge and when i checked all my Great Seal cards were numbered out of 14, with ED being 13/14 and 14/14. So don't panic.
I reported it on GitHub. For reference, because this review might not make sense to everybody, once corrected: The DB entry currently states, these are "The Great Seal #13-15."
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Susumu
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