Had a possible IT glitch with the upgrade list today. My first flight was operated by KE so checked in with them, received boarding passes for all 3 legs. The last leg was upgrade eligible. The DL app showed me checked in, but no mobile boarding passes. No big deal, KE agent had printed them for me. Once I got back to the states I realized I wasn’t on the upgrade list for my final flight. I wasn’t too concerned as based on the list there’s an almost zero chance of clearing. I visited the Sky Club at SEA and at checkin the club agent reprinted my boarding pass on DL stock for the final segment and all of a sudden I’m now on the list. Not sure if it was an IT glitch or just a result of being checked in by KE.