Oh I understand, thank you very much. You said it. but you missed 2 words. "They should not accept invalid bets that win to begin with". Maybe they should hire you to better their system.
Did you lose any duplicate or otherwise invalid bets? If you did, complain to FJ and let us know how it goes. If they don't refund you then you might have a case.
Not all the duplicated bets are canceled, only the ones that exceed 100,000 in euros.
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Tornike