I have 2 items on my Memrise Android app which do not agree with the Memrise course. When the online course was set up the two items were incorrect. The android app still has those errors even though they have been corrected online. I tried the app two ways. I downloaded the course to work off line and I also set it to never work off line. In both instances the app still did not agree with the official course.
Log off on the app on your mobile phone, then log back in. All changes to course data require this process, sadly, the app will not update its content until you do that.