Guest VM can "see" outgoing traffic of other hosts

Hello,

I have a strange issue with my proxmox implementation.
Proxmox version is 4.4-24 .

The problem is that when I run a tcpdump in one of my Guest VM's I can see OUTGOING traffic that has nothing to do with this VM's IP ( so source and destination is another VM ). This happens on all nodes ( currently 7 ) and the outgoing traffic is only visible where it should not be - per node. So if lets say I have a node1 and a VM inside this node, this VM can "see" all outgoing traffic sourced...

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