What you were expecting to happen, and what actually happened:
When on the Council of Chiefs leader board tab, and the first place player is selected, scrolling up does not take you to the bottom of the list. Also when you are on the bottom of the list, clicking down once does not take you to the top of the list.
All other leader boards function like this, such as the invasion leader board that is also currently running.
How often does this happen? When did it begin happening?
New bug with council of chiefs.
Steps to make it happen again
Check CoC leaderboard.