New crown before completing lessons?
I seem to be earning a new crown when I am one lesson away from actually reaching the new set of exercises. Not sure why Duolingo keeps congratulating me twice (once too early, and again when I actually do score X/X exercises).
I just got my 1st crown for a 10-lesson skill after doing... 0 lessons at all!
Happened a few days ago, too. A few days ago I also suddenly found myself with a crown level 2 I'd done nothing to earn. Wouldn't be surprised if these problems are related (of course, they might not be).
Congrats on your level 25!