Rgmanager service fails over when node rejoins cluster on Red Hat Enterprise Linux

Solution Unverified - Updated 2015-02-08T02:36:10+00:00 -

Issue

when i have started cluster on node1 (node was running outside the cluster while we were investigating another problem), it took over resources from node2 and caused an outage
I have started cluster services (including rgmanager) on node1. At that time the cluster service was running on node2. Both nodes have the same failover domain priority and nofailback="0" so there was no reason for cluster service to failover to node1, however it did. The question is WHY?

Red Hat Enterprise Linux (RHEL), including:
- Red Hat Enterprise Linux Server 5 (with the High Availability and Resilient Storage Add Ons)
Cluster with 2 or more nodes.
One cluster node rejoins the cluster, and upon starting rgmanager, a service "fails over" to that node
- failover domain for the service is not ordered and the service has setting nofailback="0", meaning the service should not relocate to higher priority nodes.

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