Never tried to type something by thinking only of the word (rather than specifically the sequence of key strokes) only to have your fingers execute the presses in slightly the wrong order -- giving you something like "teh" instead of "the"? I have, a lot actually, and if I'm in a hurry or distracted, it can even pass by unnoticed, leaving me with the impression I typed the correct word while having actually executed the wrong sequence. (Hurry or distracted I think would be the most analogous to systems which don't take the time to register aggregate feedback and verify correct execution after the fact.)
Humans have at least one experience of trying to execute a distributed sequence of actions and having the output be mangled by the actual ordering events so common they invented a word for it -- the "typo".
It's insanely easy to explain to people that sometimes really complicated systems make a typo when they're keeping their records, because it's such a shared, common experience.