Centos 5.2 DHCPD Issue with certain MAC's

CMTS OUTPUT---------------------------START
 1    2   00:0f:9f:57:8a:2a DHCP OFFER                    0.0.0.0         1729
 2    2   00:10:95:5c:c3:06 DHCP ACK                      0.0.0.0         1730
 3    2   00:10:95:5e:1f:7e DHCP ACK                      0.0.0.0         1744
 5    2   00:90:64:98:0f:6a DHCP OFFER                    0.0.0.0         1752
 6    2   00:10:95:28:99:f3 DHCP ACK                      0.0.0.0         1745
 9    2   00:50:04:a5:3f:32 Registered                    172.17.5.247    1737
 10   2   00:50:da:9d:29:92 Registered                    172.17.5.246    1738
 12   2   00:90:64:ee:4a:17 DHCP OFFER                    0.0.0.0         1748
 13   2   00:50:da:9c:83:74 Registered                    172.17.5.243    1749
 14   2   00:50:da:9e:64:e8 Registered                    172.17.5.242    1750
 15   2   00:11:e3:7f:20:66 DHCP OFFER                    0.0.0.0         1751
 16   2   00:50:04:a6:4e:28 Registered                    172.17.5.240    1753
 17   2   00:50:da:9c:88:bc Registered                    172.17.5.239    1754
 18   2   00:50:da:a0:1e:58 Registered                    172.17.5.238    1755
 19   2   00:90:64:95:b3:da DHCP OFFER                    0.0.0.0         1756
CMTS OUTPUT----------------------------END
 
filename "15.bin";
authoritative;
allow unknown-clients;
option domain-name "domain.com";
option domain-name-servers 208.67.222.222, 208.67.220.220;
option subnet-mask 255.255.255.0;
option broadcast-address 172.17.5.255;
default-lease-time 14400;
max-lease-time 172800;
ddns-update-style none;
allow client-updates;
# file for the cable modems
# filename "/LCN_DATA/15.bin";
shared-network Inside {
	allow client-updates;
	allow unknown-clients;
	authoritative;
	filename "15.bin";
	subnet 64.207.54.0 netmask 255.255.255.248 {
		authoritative;
		filename "15.bin";
		}
	# Cable Modems
	subnet 172.17.0.0 netmask 255.255.0.0 {
		allow client-updates;
		allow unknown-clients;
		authoritative;
		filename "15.bin";
		option routers 172.17.0.1;
		range 172.17.5.128 172.17.5.254;
		pool {
			allow unknown-clients;
			filename "15.bin";
			range dynamic-bootp 172.17.5.128 172.17.5.150;
			}
		}
	# test1
	host test1 {
		allow unknown-clients;
		filename "15.bin";
		hardware ethernet 00:10:95:5e:1f:7e;
		fixed-address 172.17.5.99;
		}
	}
                                  

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