The root cause was that the system assumed "miss" = "child". So it's a case of a mislabelled category.
The real root cause was a mistranslation: "in the country [India?] where [system programming] was performed the title Miss was used for a child, and Ms for an adult female".
The reason that the mislabeled category was a problem was that the system used those cultural honorifics to estimate takeoff weight.
The reason takeoff weight was estimated using those categories, rather than from more accurate birthdate data, or calculated from actual weight data, was...
a) the assumption that country in question was likely English-speaking (which increases the risk of translation mistakes, due to the "false friend" effect)
b) the fact that India is a powerhouse when it comes to offshoring software development.
If it's not the case, well, I wonder if someone is able to identify the country? Out of sheer linguistic curiosity
The whole thing is just bizarre - I guess it was outsourced to some chopshop.