words in the list don't seem to level up after using them
When I choose 'Words' in the bar I find the words I've learned with a bar behind them showing me when some need to be repeated. When I go down the list, I see words I used months ago (according to the list) but of which I find quite a few which I have used in the last few months. So I wonder how that can be?
Having said that, I also want to say that I enjoy Duolingo very much. I learn a lot and the system it uses works great. It really shows the way a language is used in daily life, with all it's quirky little unexpected things. Thank you so much for setting this up and keeping it going.