my server player limit 40 person but gametracer shows 32 person.

Address: 85.14.233.214 Port: 25200

I'm assuming you are only running conquestlarge since that is the only gametype that supports more than 32 players?

Actually, I have the same problem and it's related to running a 32 player rush map in the middle of a 64 player conquest sequence.. any rush map forces the server (incorrectly) to report 32 player.. it still allows 64 players to connect, but reports in the server info string as 32..

This is a documented DICE bug, only valid way to get the server count is to do a var.maxPlayers