Delete dhcp lease doesnt work

[xbipin]

im using ipv4 with latest nanobsd for dhcp clients on alix, static arp is enabled, when i got to status->dhcp leases and then click show all configured leases, the entries include the static leases i have configured as well as the ones dhcp gave out when static arp wasn't enabled but in grey, now if i try to delete those dhcp given leases, it doesn't delete