Shocked at the results - why is re-calculating your score an literally, mistake, Failed, errors, ethics

hariRaj

I was being cautious but really thought I was close to 80% on that exam.  Failed at band 6.  Thought I scored 100% (with one or two errors) on Equity and FRA, but got <=50 on both.  Only score above 70 was ethics, which I thought I bombed.
It’s all jumbled … I’m in complete shock.  There is literally no way this is a mistake, right?  (says the typical deluded failed candidate).  
Does anyone know WHY the CFA offers the opportunity to retabulate? As in, why is that an option if it never makes a difference.