When a user joins the server, they are presented with the "Deployment setup" screen, which allows them to join any of the playable factions. While there, they are presented with three (or more) different numbers that represent the number of players in:

1. Top right - total player number on this server
2. In the center (for each faction entry) - current number of players in that faction.
3. Right side (player list in currently selected faction) - number of players in that faction.

Only numbers from position 2 are being refreshed when someone joins the server/joins a faction, while the number from section 1 seems to stay with the value that was there when the user joined that server. The number from section 3 seems to only refresh when a player changes the target faction (for example, hovering the cursor over a different faction).
Additionally, it seems like the maximum number of allowed players is not being loaded from the server config. No matter if the server is set to 32 or 100 players, it will always display 64 in the top right corner.