I've noticed that progress pages on Android and Web apps show different numbers. Android is on the left and Webapp is on the right:
Both are from the same day with no training being made between screenshots. Also, I have restarted Android app and refreshed web page before comparing. If I compare "Today" pages on both apps and "History" looks like Android shows correct values and Web is off. As of "Vocabulary", I know it's more of a virtual than meaningful value, as part of my progress was estimated during placement test, but at least they should match on all devices.