stolen money
I know someone who worked here. There was a bit of scandal when money started going missing. The administration never bothered to get to the bottom of it and just blamed it on a scapegoat - a new girl.
The school is very good, though apparently a bit understaffed and always for new English-speaking hires (though, this is endemic in HK schools). If you go there (or plan on working there), just make sure to watch your valuables!