Bugged Lessons

Can you please provide some examples of lessons you noticed this problem with?
Regarding the re-appearing of lessons in the continue studying, that sounds like a caching issue. Have you tried clearing your cache?

Yeah, the lessons still showing that it has new words, even though their aren’t any, is a problem for me too. I reported it a few weeks ago here:

It happens on both the Desktop and Android, so it doesn’t appear to be specific to either one.

Here’s are two screenshots from Android from the following lesson:

I just put them in one image to save posting a second time (as posts are limited to only one image). You can see that the lesson claims there are 3 new words, but when you open the lesson and view the vocabulary, there are no new words.