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I am guessing you see the 7TB difference in the pie chart regarding data usage?
If so, I had this discussion as well, there is a different calculation used for this pie chart which does not reflect the actual disk usage, Don't ask me why but this figure should be ignored, the properties of the library will show you the actual usage figures.
Regarding the remaining snapshot jobs, check the Data Retention Forecast report to see if there are dependencies which are preventing data aging.