AAaLot

How did another passenger get in the middle of our families upgrade queue?

I recently bought 5 SEA-ORD tickets for my family. We are all executive platinum. After purchase I split the record and requested individual upgrades for all of us.

At the airport none of the upgrades had cleared....had the agent put us on the upgrade list. We immediately made it to the top of the list.

The gate monitors showed another passenger had made it between us:
AAaLot Name1
AAaLot Name2
AAaLot Name3
AAaLot Name4
Other Passenger
AAaLot Name5

The Gate Agent was actually interested in this and she could not figure it out. Theoretically [realistically] it was not possible.

Any ideas on how to solve the puzzle?

p.s. only 3 of the upgrades cleared anyway...this would have been a big deal in the case of only 5 upgrade seats