Just a quick update: in case someone might be in a similar situation like me.
I contacted MPC, they said, ask AA to first remove the FF miles etc and then follow up with us! Not sure if it's a good idea. I will mostly let it go.
You live you learn. You just had the weird situation of benefitting from a highly improvable glitch on one of your first gos around, which gave you the wrong impression. Getting double credit for mileage points is very lucky. It's not supposed to happen.
[MENTION=155338]QRC3288[/MENTION], Agreed. Just wish I had gotten both for LAX-HKG leg instead. ;-)
Anyway, thanks all for the replied and help.
Best,
-Nile