Ah ok, so that’s likely the difference then. Here the display at the self scan machine randomly decides to halt and wait for an employee at the moment you want to pay. And the employee has to rescan everything in that case. If you clearly shoplift you are reported to the police and you will receive a fine of several hundred euros. I don’t see how this can be seen as discrimination though, the machine doesn’t have eyes or ears, it only knows the products you have scanned.