You have a virtual network card without any physical boundaries, so no, this is not a bug. You can transfer data from one VM to another VM on the same host and bridge very fast and internally this uses memory copy, so that you will have a very, very huge bandwidth, which does not comply with normal ethernet standards (remember, there is no real hardware). These "huge" numbers are more an upper limit than guaranteed throughput.
I have here on one server (with only 1 GBE cards) 6 GBit/s between two virtual machines.
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