Why does the app keep erasing my progress in lessons?

Question

It happens whenever I go to a different part of the app (i.e. Code playground), and never happens when the app is shut down.

Answer 1

Slightly possible that it's connection issues (when app can not download your stats from server)

Answer 2

I had the same thing happening a few times but after a while the progress came back. Don't know uf that helps you.