i was on the dxb-pek a340-300 today early morning and seatcounter showed the flight packed to the gills in Y, I got my opup to J 3 hrs ahead automatically.(this flight took me to gold from silver

) but when we were at the gate, this gentlemen and his partner were standing in the economy line and the gate agent scanned them in and said, since the flight is full, he was getting an upgrade to F, while she stayed back in Y. I am pretty sure they both were in Y to begin with, since they were travelling together.
Has anybody received a double opup or was this a one-off thing or even only a figment of my overworked imagination.