SYMPTOM:
In Strategy 9.x and higher, users notice that when placing a project into Request Idle or Full Idle mode from the Project Monitor, changes are not propagated correctly across all nodes in an asymetrical cluster.
For example, a user may place a project into Request Idle mode from the Project Monitor:

After doing this, the project becomes Idle on the node where the action was performed, but remains Unloaded on the second cluster node.
CAUSE:
This is a known issue in Strategy 9.x and higher.
ACTION:
Currently this issue is being reviewed by Strategy for a potential code fix on an upcoming Strategy release.
WORKAROUND:
Users can first load the project on the node where the project you wish to Idle is unloaded before placing it into Request Idle.