Pretty frustrating, but I have no idea how I've managed to score a $1400 refund

I will see how this develops and report back on end result.
Hopefully it re-tickets asap as I've got a few QR flights in the mix. I did asked for it to be processed manually asap which they said 'we'll keep an eye on it and let you know how it goes'.
My new and hopefully final J itinerary is:
MEL>ADL - QF
ADL>DOH - QR
DOH>DXB - QR Y (stop)
DXB>DOH - QR Y
DOH>ESB - QR (stop)
ESB>IST - Paid sector to be booked
IST>LHR - BA (stop)
Pick up a french lease car in London
4-5 day drive from London to Bosnia stopping in Northern France, Munich and Zegreb
Visit family in Bosnia
Drive from Bosnia to Italy via the Adriatic Coast - Dubrovnik, Split, etc.
FCO>LHR - BA
LHR>JFK - AA (stop)
JFK>BOS - AA Y
BOS>NRT - JL (stop)
NRT>MEL - JL
Final taxes and fines are TBD.
When madrooster looked into my PRN he advised that taxes weren't right and I needed to be charged more. QF have just advised they are refunding me $1400 so lets see how it plays out and what the final amount is.