[Pacemaker] problem with resource group

[Luca Meron]

Hi.
I've created a 2 node active/passive cluster. The HA manages 17 resources, among IP and other services.
But I've a problem when resource placement: after I add one of the latest resource, it is started on node2 instead of node1 with all the others!

I couldn't really find a reason for this into syslog. I was adding a couple of resources at a time to the cluster, and when I added Cluster-winbind it was started on host2! Why is this happening?
Also, I tried stopping corosync on host2 and all resources were started correctly on host1, but when I retarted it on host2 while primitives were started on host1 it attempted to start them on host2 also!
I'm using ubuntu 10.04 fully updated, corosync from ubuntu-ha-maintainers ppa, corosync 1.4.2-1ubuntu0~ppa1, pacemaker 1.1.6-2ubuntu0~ppa2.
Thanks

Some parts of the config:
primitive Cluster-FS-DRBD ocf:linbit:drbd \ 	params drbd_resource="r0" \ 	meta target-role="Started"primitive Cluster-FS-Mount ocf:heartbeat:Filesystem \ 	params device="/dev/drbd/by-res/r0" directory="/srv" fstype="ext3" \ 	meta target-role="Started"primitive Cluster-IP ocf:heartbeat:IPaddr \ 	params ip="192.168.1.1" cidr_netmask="24" nic="eth0" \ 	op monitor interval="90s" \ 	meta target-role="Started"[...]group rs Cluster-FS-Mount Cluster-Zimbra-FS Cluster-IP Cluster-IP2 Cluster-IP3 Cluster-nfs Cluster-smbd Cluster-nmbd Cluster-apache2 Cluster-vsftpd Cluster-winbind cron_backup cron_set1 cron_set2ms MS-r0 Cluster-FS-DRBD \ 	meta master-max="1" notify="true"colocation Mount-on-r0 inf: rs MS-r0:Masterorder group-after-mount inf: MS-r0:promote rs:startproperty $id="cib-bootstrap-options" \ 	dc-version="1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c" \ 	cluster-infrastructure="openais" \ 	stonith-enabled="false" \ 	expected-quorum-votes="2" \ 	last-lrm-refresh="1336942125" \ 	no-quorum-policy="ignore"