Windows 7 network performance monitor inconsistency

I am doing a backup using disk2vhd from former sysinternals (now Microsoft) Mark Russinovich and I’ve found something puzzling.
The source is a W7 ultimate machine, the destination is a SMB share on a W7Pro connected to the same 1Gb/s Ethernet switch.
The two systems are not doing any other significant network activity but I see resource monitor reporting very different network use on the two sides of the transfer.

I am monitoring the destination machine from the source machine using teamviewer (great tool free for personal use) and here is the picture of the two paired resource monitors:
networkuse
The source machine (on the right side) reports a network use that is significantly lower than the destination machine (on the left side).
The source machine also shows that the largest transfer alone (the backup) has a higher throughput than the total reported.

I was thinking the discrepancy might be related to a time drift in the reporting, but the graphs show that is not the case: the destination system constantly reports a higher network use.
Does anyone know if it is a known bug in W7 and how to fix it?

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