
Sh-t Happens with technology! Mostly human error

and remember on data entry when you visit your doctor or specialist, and say the wrong thing, like you have more than 2 drinks a day when you are stressed, you will be stamped by many enthusiastic doctors has an alcoholic and it's impossible to get the records straight!
The problems arise everywhere in government with technology, were some dickhead has typed in wrong information and the person reading the data takes it has true when it was said in jest! Talk about making mountains out of mole hills and the human error is the biggest offender!
Also the reason why the British Army, Police and other security forces collect useless out of date information based on what others have wrote down without verifying, it happens alot. I shouldn't worry about your passport not scanning, but what others are feeding into the system every time you visit a government agency
Basically it's oral communication that gets distorted along the chain if it's not secured by protocols, some data have weaker links than others which may trigger a flag, but even then it's human error or trial and error for increasing security issues.