Multiple lease problem

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Has anyone run across a problem where Win2K clients take 3 lease addres=
ses.

I had been running ISC 2.0 and ISC2.0PL5 for a couple of years now and =
noticed this problem from time to time until recently when I installed =
DHCPStatus,  a web frontend for ISC DHCP.  Every WIN2K client that I ha=
ve takes 3 lease addresses,  don't have
any 95,98, or NT clients anymore.  I moved to version 3.0pl1 and tried =
adding some options(one-lease-per-client on and deny duplicates) to lim=
it leases and have looked at the PC's that are getting the multiple lea=
ses and haven't come across a reason( no
VPN type programs,  "ipconfig /all" only shows one address,  etc ).

Am I running into an undocumented or obfuscated feature?

Here's the top slice of my dhcpd.conf

#
# DHCP Configuration file
#
# for ISC distribution
#
default-lease-time 86400;
max-lease-time 86400;
deny bootp;
authoritative;
#
option domain-name "abq.sc.philips.com";
option domain-name-servers 130.140.14.8, 130.140.3.9;
option netbios-name-servers 130.140.3.24, 130.140.14.1;
option ntp-servers 130.140.3.29;
one-lease-per-client on;
deny duplicates;
log-facility local6;
ddns-update-style none;
#
subnet 130.140.3.0 netmask 255.255.255.0 {
   option broadcast-address 130.140.3.255;
   option routers 130.140.3.254;
   range 130.140.3.140 130.140.3.144;
   range 130.140.3.183 130.140.3.189;
   range 130.140.3.190 130.140.3.196;
   range 130.140.3.221 130.140.3.226;
}

And here's a portion of the dhcpstatus page for one of my subnets
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
|  IP address | Lease|   Lease  | Lease end|                  Mac addre=
ss                  | DNS |     WINS name    |
|             | statu|   start  |          |                           =
                    | name|                  |
|             |   s  |          |          |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
|             |      |          |          |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.14| Activ| 20/01/200| 21/01/200| 00:c0:4f:70:95:16         =
                    |     | phototechpc      |
| 0           | e    | 3        | 3        |                           =
                    |     |                  |
|             |      | 07:25:09 | 07:25:09 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.14| Activ| 20/01/200| 21/01/200| 00:b0:d0:82:55:ec         =
                    |     | USBABQ9201WS103  |
| 1           | e    | 3        | 3        |                           =
                    |     |                  |
|             |      | 05:31:21 | 05:31:21 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.14| Activ| 20/01/200| 21/01/200| 00:c0:4f:70:95:16         =
                    |     | phototechpc      |
| 2           | e    | 3        | 3        |                           =
                    |     |                  |
|             |      | 07:23:15 | 07:23:15 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.14| Activ| 20/01/200| 21/01/200| 52:41:53:20:60:c5:7d:a6:57=
:bd:c2:01:01:00:00:0|     | TRAINING-PC99    |
| 3           | e    | 3        | 3        | 0                         =
                    |     |                  |
|             |      | 05:17:11 | 05:17:11 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.14| Activ| 20/01/200| 21/01/200| 00:c0:4f:06:a1:ea         =
                    |     | USBABQ9201WS108  |
| 4           | e    | 3        | 3        |                           =
                    |     |                  |
|             |      | 00:58:39 | 00:58:39 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
|             |      |          |          |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|
| 130.140.3.18| Activ| 20/01/200| 21/01/200| 00:b0:d0:82:55:ec         =
                    |     | USBABQ9201WS103  |
| 3           | e    | 3        | 3        |                           =
                    |     |                  |
|             |      | 05:31:21 | 05:31:21 |                           =
                    |     |                  |
|-------------+------+----------+----------+---------------------------=
--------------------+-----+------------------|



=



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