Same VM wrongly running on both node

Hi,

I have a two node cluster running PROXMOX 2.2 with multipath shared iScsi storage.
Something really bad happened and I don't understand if I made something wrong:

I was working with a kvm vm on node 2 and when I was satisfied with the its state I put it
(while running) in HA configuration with autostart.
After a while I noticed that the vm was "migrated" to node 1, BUT WAS RUNNING ON NODE 2 too.
I don't know what I did wrong, rgmanager simply did not notice that vm was running on node 2 and started on node 1.
I'm trying to recover the filesystems now.

I hoped that even after a wrong procedure (as it might be put a running vm in HA) the cluster would have not allowed such a behaviour.
Did I miss something else ?