You have a second entry in Asia which is not part of a transit between SWP and Europe so the itineray is not valid. The way around it would be to go SYD-JNB. Also, are you aware the UK is one of the most expensive places to start an AONEx?

Edited to add: not that it is very important but if you post your itinerary this way: LHR-YVR-JFK-EZE- etc., it would be a little easier to read.