The PVS farm shows all PVS servers under the Servers node. However, when you click Show Replication Status of the vDisk does not show all PVS servers listed. The other servers have the vDisk files (.vhd, .pvp) but do not show up in the list.
In the PVS Store Properties go to the tab Servers make sure that all PVS servers are selected as providers for this Store.
If the PVS server that is not showing on the Replication Status window is not selected, you need to include it as a provider.
In the vDisk Load Balancing window make sure that the "Use the load balancing algorithm" option is selected if not will only show the PVS server listed under "Use this server to provide the vDisk" in the Replication Status window of the vDisk.
PVS servers were not included in the PVS Store as providers.
In the vDisk Load Balancing window using option "Use this server to provide the vDisk".
Citrix Documentation - Installing and configuring Provisioning Services
Citrix Documentation - Managing Stores
Citrix Documentation - Using the provisioning Services Console
Citrix Documentation - Managing vDisks