I had 4 out of 5 bars in a particular lesson I did a strengthening exercise and you didn't increase it to 5 then I went ahead and did a lesson over in the same topic and you still didn't increase it to 5 the more I use this program the more it sucks and saps your motivation
Depends on how solid you are when you redo it. If you make lots of errors as you go and it takes a while, or if you use the cursor to “hover” over words for hints a lot, it assumes you don’t really have that skill down cold. Consequently it won’t fill it up to 100% completed, solid gold.
I’ve managed to get all of mine gold with no issues, but I’m reasonably fluent (B1+).
If you are going through with no errors and no hovering, and it still won’t show solid gold, then there’s surely an issue.