"mine" leaderboard is toggling, not selecting
The "mine" option on the leaderboard pane toggles your current character prophecies on and off. It does not Select which prophecies your character is part of.
Example : a character that is part of the Butcher Prophecy only. If you highlight all of the prophecies, then repeatedly click "mine", it will toggle the butcher prophecy on/off, but it will not turn off (or change the current state of) any of the other prophecies you are not part of.