Why all the interfaces on the system are getting same ip addresses ?

Issue

• After system reboot, interfaces are coming up as below:

Interface       Slave Of  IPv4 Address        State  MAC Address
  =========       ========  ==================  =====  =================
  lo              -         127.0.0.1/8         up     -
  usb0             -        172.16.A.B/24     up     6e:ae:8b:xx:xx:xx
  eth0            -         172.16.A.B/24     up     00:00:c9:xx:xx:xx
  eth1            -         172.16.A.B/24     up     00:00:c9:xx:xx:xx
  eth2            -         172.16.P.Q/24     up     6c:ae:8b:xx:xx:xx
  eth3            -         172.16.A.B/24     up     6c:ae:8b:xx:xx:xx
  eth0.4007@eth0  -         10.113.X.Y/24      up     00:00:c9:xx:xx:xx

• The interface files are configured with: ifcfg-eth0 has IPADDR=172.16.A.B, ifcfg-eth2 has IPADDR=172.16.P.Q and ifcfg-eth0.4007 has IPADDR=10.113.X.Y. Rest ifcfg-eth1, ifcfg-eth3 does not have any ip addresses mentioned, still they are taking ip address as above after boot.