Changed the script as instructed, seems to have solved my issue. Using "iptables -t nat -xvnL" without the change, I reading the source as 0.0.0.0/0 when I applied the firewall rule in web admin. After the change, the source correctly shows the ip I specified under "Limit to IP" when I reapplied the rule.
Thanks for the help!
Thanks for the help!