[CentOS] IPTables not working?

Hello CentOS,

I'm having a strange situation on one of my servers. I'm running CentOS with all the latest yum updates. It runs fine, but iptables does not seem to be 'consistently' dropping the packets from the IP's I've put a drop rule in for. When I do iptables -L I still see the rule in place:

iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere DROP all -- ip176-0.netcathost.com/24 anywhere

With this rule in place and iptables running, I am now getting the blocked IP's showing up in my apache logs again. this used to work... has something changed?