Same issue on android. Made me cancel my premium because I was tired of the web UI being poorly designed on mobile (text gets cut off, windows get cropped) and the app was too buggy. I only bought premium for the unlimited lessons and seeing how many technical issues there were made me unsubscribe :/
I have deleted and reinstalled the app restarted the iPhone, but it still has not resolved the issue.
Could it be a software bug or have I got something wrong
regards Wayne