Size reports in OpsCenter... before or after dedup ?

In OpsCenter, "Job Size" report seems sometimes to be the size before deduplication ("scanned" count in job report), and sometimes the size after ("sent" count in job report).

I do not understand why this is not always the same value ... it seems to depend on the place where deduplication is done (on the client, on the media, on the master) and / or the version of OpsCenter ?

How can we always get the same value?