Originally Posted by
tosaerba24
She scanned my BP, red light appeared, and the computer said, "Passenger has already boarded." It also showed my bag as loaded onto the plane.
As all of these things happened after you went back, the chances are that when she said "You're not on the passengers' list" she was simply wrong for some reason. And if she was wrong, then I would have thought that there's absolutely nothing for you to worry about. Although she might perhaps need to go to Specsavers.