I've done some of the quizzes in the grammar section of the Community Lists. Even after a few completed sessions under the same subsection, e.g. Verb Transitivity and Noun Counters, my progress remains at zero percent. Have I missed ticking a box somewhere for progress to be shown?
I didn't know what these were either, but if you take a look at Vert transitivity -> Genki I, it has 29 expressions. Now if you click into the list itself, you see that it has 58 terms (essentially just "words"), in pairs (transitive/intransitive).
The way I think it works is that, because you're not really studying those individual terms, you don't get any mastery for them and those "expressions" don't really "exist", so that % counter doesn't work.
Anyway, @Anonymous123 already answered your question.
