I have been having problems with the oneworld website - more likely I am the problem - trying to get an itinerary for the cirle trip explorer. I saw a sample itinerary, but wanted to start in LHR.

Here is my proposed itinerary:
LHR-CPT-JNB-SYD-MEL-BNE-SYD-HKG-LHR
but it would not let me complete the trip from HKG to LHR for some reason! Stopovers will be at all above (except for JNB).

Could someone please help me? I would like fares for both Y and J. Thanks!