That makes sense though it seems unlikely that 75% of all clicks that FB registered were misclicks in that sense, i.e. that they were not only misclicks but people reacted extremely fast to “undo” them. And even that were the case, I’d expect that FB doesn’t count these, since what they’re selling to me are “Website clicks”.
For me, the conclusion is: don’t trust Facebook Website promotions and multiply whatever price estimate they give you by four in order to get a realistic estimate.