Hey, thanks for bumping this.
This actually happened to someone else recently too. I replied in this thread here:
Unfortunately, there still hasn’t been any official response from LingQ support on how to properly fix it.
From what I’ve seen, the two most practical options right now are:
- Go through the lesson and manually LingQ the words again so they turn back to yellow (learning). This works but takes time if a lot of words were affected.
- Reset the course/lesson entirely and re-import it. This is usually faster if a big number of words got marked as known by mistake.
It’s pretty annoying that there’s still no easy “undo” feature for this. Hopefully they add something eventually.