wrong holidays region

Hi people, and hopefully Apple-guys,

The calendar on my iPhone shows Canadian or Mexican Holidays, my iPad the HongKong holidays.

Both are set up in English, with Belgium as location.

- iPhone 5: Problem exists in both iOS 7.1.1 (Canadian) and 7.1.2 (Mexican)

- iPad Air: iOS 7.1.2 (HK Holidays)

Someone knows about this error ? And knows a fix or when a fix will come ?

(Changing the language of my iPhone to Dutch is not something I want to do)

Should I file a bug report somewhere else to let the Apple-guys know ?

Steven