Your eTicket should show by sector the baggage allowance. A mixed F/J or J/Y journey needs to show somehow the difference allowances by sector.
The oneWorld RTW agreement will also set out the baggage allowance for the entire journey, Logically it won't have exceptions. However it is possible to include a side trip on the same ticket that could have a different allowance.
I'd write to AA and ask for your money back, supported by your eTicket. I'd also complain to QF asking them to intervene with their partner.