Not registering completed lessons properly
Last little while I've noticed that my skills don't seem to be counting properly.
Just as an example, today I was on 0/30 level 4 for a skill. I did 5 lessons and my daily goal showed 50xp, but that skill still said I'd only done 4/30. This has been happening almost every day lately. Not a big deal just a little annoying and wondering if there's a fix for this.
Unfortunately, Duolingo's servers are very slow in synchronizing the data on your device and the databases on their servers.
1) Never log out Duolingo or your device before you have forced the synchronisation:
Select another course in the App
Tap the flame icon to check if it still shows "You've met your daily goal"
Refresh your browser.
2) Check the synchronisation in your unofficial but very useful progress page
3) More tips in
"Checked on your Streak freeze today?"