Get-vm show duplicatet VM

Hi,

i have a Windows Server 2012 R2 failover cluster with 2 nodes.

When i run "get-vm" from one of the nodes i see many VMs duplicated.

I tried to follow this:

http://community.spiceworks.com/how_to/528-killing-ending-a-hyper-v-virtual-machine-that-is-stuck

but the really strange fact is that when i kill the process related to the "zombie" vm,it seems i don't kill its process, because the right VM shutdown instead the "zombie" one and when i execute again "get-vm" the wrong vm is still there

Any ideas ?

Thank you.