pfSense

i use the dhcp server with static arp and deny unknown clients ticked but suppose when those r unticked, it allows clients to get ip and out of them i add a few to static mapping and leave some alone, then when i enable static arp and then goto status->dhcp lease, it shows the complete list of the static mapping i have done, when i click show all configured lease button then it shows the older lease which don't have a static mapping, next to those entries is a button that says delete the lease, on pressing that it doesn't delete those old dhcp leases entries