There is no HDD usage data from US1 for several days, ad big traffic started, I hope counter not down again.
I thought all those numbers were gone now, officially? Too bad 
no no no, Satellite should show your node usage in dashboard.
The average used has been unstable for several years, as it is now. Perhaps the calculation hasn’t finished yet or was interrupted. Either the hole in the chart will disappear if the calculation took a long time, or the hole will remain if the average value has dropped. There’s no hole on the client’s chart (I checked this in my account). Since when did the hole appear in yours?