There's a maximum capacity of players on the server, currently 50. That explains it all, don't be asking what's the problem, you already should know what is. Anyway, I guess spawns are duplicated automatically when a map haven't got +49 spawns, just like DD. Try to be simple making your maps, don't be adding stuff everywhere, that makes it confusing. Never use ghostmode on shooter maps, just add 50 spawns on every map you make.