Do you have "Enable English-to-Chinese" enabled in Settings > Flashcards? Or are there any card filters active? If it still doesn't work, I'd recommend adding the corresponding Chinese-to-English cards from Chinese-to-English dictionaries, then doing the flashcard test with Show: Definition. The difference between E-C and C-E with Show: Definition is that the former gives you one English word with multiple Chinese words as the answer, while the latter gives you all the meanings of one Chinese word and only has this one Chinese word as the answer.
So for regular Chinese learning, C-E with Show: Definition works better, for advanced learners or translators who already know the Chinese words well but wish to recall all the possible Chinese words for one meaning, E-C works better.