I think what you are seeing is this, and I could be wrong here but.... When you enter a ready-go and "post" a score. That score is not revealed on the leaderboard, in your history, or in your live feed until the final entrant has signed up for the event. (not all scores posted)
So there could be a period of time where your score is 'gone' and you can't see the leaderboard.
Note: there was a bug (well maybe not a 'bug') where a score would get posted on a live feed whether the tournament was full or not. Not sure if it is still that way or not, haven't bothered to check.