Need help about user IP

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http://forums.cpanel.net – helo ppl.. i have some problem.. and i dont know how to fix it.. this is a problem.. i run a website, and everybody can register... until i find some user spam in my forum... so i go to administrative page and want to ban spam user.. but i notice that every user IP had a same IP that is my server IP.. i test with php scripts to show ip address.. it's show my IP address is server ip, its should be my ip from internet provider but i put that script to another server.. it's show my ip from provider, not IP from server i host.. what is going on? i really dont know... there's something wrong (HowTos)