From FHL IME

It may sound crazy at first blush — and there are other factors — but one reason the original FHL list contains so many Hanji is because it contains a great number of obscure Hanji that were never used in traditional Taioanese-speaking society. Most of these obscure Hanji probably entered the FHL list via Campbell (甘字典), which collected obscure Hanji in keeping with the fashion of Qing times (which reached Formosa very late), and the cultural conceits of proto-Chinese (Tionghoa) nationalism — both based on inferiority complexes.