Progress not saving / XP not counting
I've completed "Dates" (Japanese) lv 1/5 twice today. The first time it did not save my progress, the second time it did not add to my daily XP progress.
Sounds like a bug, you can report it here:
I'm having a similar issue in the Japanese course, after the app update (Android). I completed 4 lessons in Japanese today, only one counted so far. The interface shows the lesson completed and the XP, but when I do another one, it seems to erase the previous lesson (and its XP).