That section is actually an older part of the app that we actually pulled out of the new Emma Plus.
The way that section is designed, it only looks for contacts who have Signed Up using a Classic Form. It does not include integrations, lightbox forms, or imports.
If you want to pull that information for all of your signup methods, I would suggest setting up a segment like this:
That's with CONTACT INFORMATION > CONTACT SINCE > IS WITHIN THE LAST > 7 > DAYS
That way you've got a Segment that you can check every week (or whenever) to show you anyone who's been added.
Remember that with Segments, if you're just checking numbers from within the app, you'll need to make sure to open the Segment so that the numbers in the grids update. If you are sending to Segments, the criteria for the segment runs at the time of send, but it doesn't update the display numbers until the segment is opened.
Let me know if you have any additional questions about this!