Hello,
DA loads whatever is setup in the /usr/local/directadmin/data/admin/ips/* directory.
If you are adding the IPs yourself via the:
/etc/sysconfig/network-scripts/
directory, then they'll be loaded before DA loads them, do when DA does it, they'll probably fail. So what you'll want to do is remove the IPs from being loaded before DA, most likely from that directory (network-scripts).
John