nmblookup -M "-" shows two browse masters

[Joel Hammer]

I have two subnets, 192.168.1.0 and 192.168.0.0).
I have one router and one winserver combined on one linux box.
I have this in my winserver/router smb.conf:
netbios name = JHAMMER6
        os level = 65
        preferred master = True
        domain master = True
        wins support = Yes                      

In another linux box on one subnet I have this in its smb.conf:
 
[global]
        netbios name = HAMMER2
        interfaces = 192.168.0.2
        wins server = jhammer6       

When I run nmblookup -M '-' I get the following:

[root at jhammer6 httpd]# nmblookup -M "-"
INFO: Debug class all level = 1   (pid 5220 from pid 5220)
querying __MSBROWSE__ on 192.168.0.255
192.168.0.6 __MSBROWSE__<01>
192.168.0.2 __MSBROWSE__<01>             

My confusion comes in when I seem to have two browse masters.
I am guessing that the router is the browse master for the subnet
192.168.1.0 and that 192.168.0.2 has taken over the job for the other network
192.168.0.0.
I would have thought that os level = 65 in the router's smb.conf would have
made the router the browse master for both subnets.
Any insight appreciated,
Joel