[OJS 3.1.2.1] Reviewer stats (rating, activity) in a multijournal site

On a multijournal site, I noticed that the reviewer stats – rating and activity information – are shared among journals:

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At first I thought this data would only be applied within the journal context, but it seems to be pulling information from all journals and combining them together.

Is this how this feature is supposed to behave?

OJS 3.1.2.1.