So if I understand you correctly, the "Leaderboard" widget, which you set to show the top 5 users on your website with the most points sometimes shows all users and not just 5?
Can you tell me about how you use this widget? What settings you choice for it so I can try and replicate the issue?
Ranks and Rankings are two different features.
Rankings is used as a form of "Leaderboard" where users are listed according to who has the most points.
Ranks is an optional extra feature where you can give a user a particular rank when they reach certain amount of points.