Probably in your Nerf.ini file (located in the system folder) there should be multiple settings for bots including "initial bots" which should be set to 5.
However, I also recommend using map-based bot numbers. If you open the console while in the match (~ key) try the command "botbalance". The console should reply with "bot balancing has been <enabled / disabled>". The goal is to enable it here and you may need to enable it for each gamemode you play.
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