The glitches wouldn’t be arbitrary like that. There is no need to assume a data corruption issue or anything like that to explain the glitches. It’s much more l

The glitches wouldn’t be arbitrary like that. There is no need to assume a data corruption issue or anything like that to explain the glitches. It’s much more likely in my opinion, that the system regularly receives bad input due to people behaving in ways it wasn’t able to track. For example not scanning, double scanning because the attendant was moving the scanner around rapidly, people needing to exit the line due to one member of a larger party (eg a child or spouse) having a problem after part of the group had already been scanned.