DHCP failover not balancing

[Michael Robbert]

I have got a problem with my DHCP servers(3.1.1b1) that are setup with 
failover. The initial problem looked like this:
DHCPDISCOVER packet is sent and is recieved by both servers. Primary 
says "load balance to peer" and Secondary says "peer holds all free 
leases". No lease is given and user can't get on the network. Upon 
investigation I have found that the pool messages logged on each server 
do not agree with each other. For the pool in question it looks 
something like this:

Primary server:
Aug 20 09:17:04 primary dhcpd: balancing pool 8123240 1.2.3/22  total 
949  free 206  backup 382  lts -88  max-own (+/-)59
Aug 20 09:17:04 primary dhcpd: balanced pool 8123240 1.2.3/22  total 
949  free 206  backup 382  lts -88  max-misbal 88

Secondary server:
Aug 20 09:17:04 secondary dhcpd: balanced pool 8123178 1.2.3/22  total 
949  free 588  backup 0  lts -294  max-misbal 88
Aug 20 09:17:04 secondary dhcpd: balancing pool 814e9f0 1.2.3/22  total 
30  free 19  backup 0  lts -9  max-own (+/-)2  (requesting peer rebalance!)

Our setup has been running without problems for some time now, but I 
have always noticed that lts values are quite often much greater or less 
than 1, which according to my reading should not happen on a regular 
basis. This is a university campus so the problem has reared its head 
now that students are back on campus, but this was working fine last 
spring. Here are the basics of our failover setup:

failover peer "primary-secondary" {
        primary;
        address 1.2.3.2;
        port 520;
        peer address 1.2.3.3;
        peer port 520;
        max-response-delay 30;
        max-unacked-updates 10;
        load balance max seconds 3;
        mclt 1800;
        split 128;
}

failover peer "primary-secondary" {
        secondary;
        address 1.2.3.3;
        port 520;
        peer address 1.2.3.2;
        peer port 520;
        max-response-delay 30;
        max-unacked-updates 10;
        load balance max seconds 3;
}

What can we do to get these pools balanced?

Thanks,
Mike Robbert