I had a really weird thing happen today.

I checked in on my flight from LAX-HNL using the app, showed up on the upgrade list, it didn't clear. The usual, if you will.

When I went to scan the mobile boarding pass at the gate it brought up a red screen with "passenger not found". They sent me to the gate and they said I had no ticket for the flight and didn't understand how I made it to the gate. They finally called the help desk and got it reissued, supposedly a schedule change had happened. I had accepted it on the website weeks ago. Has this happened to anyone before?