please look at this picture

Could somebody explain, why the first row (213.227.210.11 is the WAN IP) shows 2.6 GB, and if we sum all LAN IP's traffic, we definitely will not get 2.6 GB.
I didn't sum right now, but today afternoon there were 1.6 GB at WAN IP vs. 470 MB of all LAN IPs summary.
And if we sum WAN IP total traffic and the summary traffic of all LAN IPs, we will get the total amount of 3.8 GB, as shown at the bottom.
I don't understand how 2.6 GB for WAN IP appears, why?..
Thanks!
P.S. Of course I understand that Astaro has "service" traffic - updates, signatures etc... But it can't be more than 1GB per day...
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