That can happen when two different words have the same English definition in the database. In this case, the website was expecting 学術 as the answer. It is smart enough to choose 科学 as an alternative answer (perhaps because it is also two kanji long and shares the kanji 学), but not smart enough to realize that the English definitions given for the two words are actually identical. So when you pick a choice which is not the one it is expecting, it thinks you are wrong.
January 24, 2016 at 5:40pm