[CentOS-virt] KVM and Virt-manager

Hi folks...

I know, that perhaps this is not the right list for this question, but I need some help...

I had install UBuntu with KVM. I deploy some Vm's with virt-manager. Everything works well, but when I use the control panel fro virt-manager, to force shutdown off a machine, some other machine that I do not select, down too... I click with right buttom from my mouse, select the proper machine to force shutdown, but the selected machine and other randon machine folling down together... some trick?

thanks