It sounds like there was a faulty sensor somewhere that led them to believe more was onboard than there was. I don't see how else to interpret their statement regarding ba calculation of 1.44l left.
I got the impression they were hoping for leniency on the basis that either a) they genuinely thought there was more fuel or b) there is more fuel, it just can't be extracted as per the expectations of the scrutineers.
I don't think either is going to get them very far though.