I figure out what the problem is. Unfortunately, there is no solution apparently. The passenger details for an award flight seems to have the same frequent flier number for each passenger. You can try to change it online but it reverts back after saving the changes. I called QR to select the seats and asked them if they could just remove the FF number. They said they could because it would cancel the award ticket. This sounds lame. Why does seat booking even have to access frequent flier information? Sounds like an IT issue.