Library counts on the right are reasonable ... the count on the left???
What do the facet counts for "Last Updated" look like?
I don't understand what you are trying to communicate MJ. Are you comparing the "added 10" (right screenshot) with the "1120 updated" (left screenshot)? Added ≠ Updated.
Oops - that's what I meant to show
I think your confusion is that you are seeing a popup link at the bottom which says "7 days" and seeing a number at the top which has more than 1000 updated sources. The message at the bottom is unrelated to the 1000+ sources. If you click on the "7 days" hyperlink, it will open your library, filtered to the recently updated sources within the past 7 days.
The reason that you are seeing 1000+ updated sources is because (apparently) you have not clicked the "x" to dismiss the notification. That list will continue to grow until you do so.
This is the piece I didn't know ... I have never clicked the x as a matter of habit.