Empty lists of 'view last battles'

There are empty lists of ‘view last battles’ for example https://www.codingame.com/multiplayer/bot-programming/a-code-of-ice-and-fire/leaderboard some players like 3th and 4th place have no replays at all. Other players got a few replays only.

Empty list is not the goal the list was made for. Over a dozen replays should always be available for spectators. Especially for those in lower leagues who want to imitate best practices.

I assume the reason is time of expire of replays. My idea is to lock a dozen replays and prevent them from deletion.