I've completed one leg of a a return ticket LHR-HKG in premium economy (seat 34G), but now Qantas (and BA) web site are saying I'm in row 23 for the second/return leg. Does this mean I've finally scored a free upgrade?

Its a Qantas operated 747 departing 2 November. I was thinking of putting in a points request for an upgrade, but if Qantas has already upgraded me I won't bother!

If anyone knows how their free upgrades work in advance it'd help to know thanks.