German 5000 words

I’m doing the 5000 German Words course on the Android app. Something has gone wrong with this since the last update. My translations of the English into German are constantly being marked wrong, even for basic words, I know 100% I’ve typed right and have double checked for typos (eg. Das Argument). These words are getting added to the ‘difficult words’ list, so I’m constantly having to repeat vocabulary I know, rather than learning new words.