Leaderboard is resetting

I installed some games today and did the "Install All". For some reason it resets the leaderboard. It has done it twice on me. The first time I never knew what was doing it.

[Gemma]

Have you been deleting games? If you delete a game you need to go into Score Tools and rebuild the league.

[Boofo]

Yes, I deleted a couple. I didn't know that, thank you.

Is there anything else I need to do along with that?