Having issues with old data, DNS/DHCP

I'm having a few issues with DNS/DHCP, I'll ask about these one at a time.

bind 9.9.7-P1, dhcpd 4.2.5-P1, Slackware 64, 14.1

First, old leases seem to hang around forever in /var/state/dhcp/dhcpd.leases, example below. Those listed are from back in March. None of the computers in the lease file are currently connected. Why are they hanging around?

Should static IPs be in there? If so, something is not working.

/var/state/dhcp/dhcpd.leases

# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.2.5-P1

lease 192.168.0.101 {
  starts 6 2015/03/07 11:46:52;
  ends 0 2015/03/08 11:46:52;
  tstp 0 2015/03/08 11:46:52;
  cltt 6 2015/03/07 11:46:52;
  binding state free;
  hardware ethernet 00:16:17:46:70:69;
  uid "\001\000\026\027Fpi";
}
lease 192.168.0.104 {
  starts 2 2015/03/17 17:01:10;
  ends 3 2015/03/18 17:01:10;
  tstp 3 2015/03/18 17:01:10;
  cltt 2 2015/03/17 17:01:10;
  binding state free;
  hardware ethernet c8:9c:dc:6e:24:e8;
  uid "\001\310\234\334n$\350";
}

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My dhcpd.conf file:

authoritative;

ddns-updates on;
update-static-leases on;
allow unknown-clients;  # default, deprecated (man dhcpd.conf)
ignore client-updates;  # see https://www.centos.org/forums/viewtopic.php?t=29256, man dhcpd.conf: ignore client-updates
ddns-update-style interim;
default-lease-time 86400;

log-facility local7;

zone hprs.local. { primary 192.168.0.2; }
zone 0.168.192.in-addr.arpa. { primary 192.168.0.2; }

subnet 192.168.0.0 netmask 255.255.255.0 {
    option routers 192.168.0.2;
    range 192.168.0.100 192.168.0.254;
    option domain-name-servers 192.168.0.2;
    option domain-name "hprs.local";
    ddns-domainname = "hprs.local.";
    ddns-rev-domainname = "in-addr.arpa.";
}

# Web Server (Linux)
host webserver {
    hardware ethernet 60:A4:4C:61:9C:FE;
    fixed-address 192.168.0.3;
}

# SQL Server Database Server (Server 2008)
host server {
#    hardware ethernet 40:E0:4C:39:7F:61;
    hardware ethernet 3C:1E:04:47:16:B0;
    fixed-address 192.168.0.4;
}

# Network Attached Storage (Linux)
host ohprsstorage {
    hardware ethernet F4:6D:04:60:04:38;
    fixed-address 192.168.0.5;
}

# COMMON workstation (WIN7)
host COMMON {
    hardware ethernet 2C:27:D7:2F:CF:7A;
    fixed-address 192.168.0.58;
}

host ricoh {
    hardware ethernet 00:26:73:55:63:AB;
    fixed-address 192.168.0.20;
}

# Postage meter
host postage {
    hardware ethernet 00:10:60:B6:72:D4;
    fixed-address 192.168.0.21;
}

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