Originally Posted by
ISTFlyer
It's completely normal that the system would ask for money for your wife on a separate reservation. It's not a glitch or a bug.
You might try contacting a sales office for this and please report back your experience if you do so. By the way, seat selection is free during OLCI.
Agree. You cannot add your FF to your wife's PNR - name validation would fail. So, from the system perspective your wife is a non-tiered passenger who needs to pay for the seat assignment. Not a glitch.