You’ll notice that the ring is broken into a number of segments. That number correlates to how many times the Action must be logged to begin establishing it as a habit. When the ring fills up, that means the user has "mastered" that Action. The Action will be added to their Trophy Case in their Profile. Users can continue to log an Action (and earn points) even after it has been “mastered.”
Mastering an action is not related to the limits on actions (https://joulebug.zendesk.com/hc/en-us/articles/360027736311-I-ve-hit-a-limit-on-an-Action-what-does-that-mean-). Just because the ring is not full, does not mean it can be logged without time restraints, and just because it is full, does not mean it cannot continue to be logged.