Thanks for the reply. All of the content is new. (This is our first time running the streams so I could totally be overlooking something or confused so please just let me know).
In the Leads view it makes it look like they've been sent the content:
![0EM50000000QzZX.jpg 0EM50000000QzZX.jpg](/t5/image/serverpage/image-id/14757iE07A6E62123CCCBF/image-size/large?v=v2&px=999)
and same in the dashboard (although in the dashboard it doesn't have the 326 for email 2??):
![0EM50000000Qza6.jpg 0EM50000000Qza6.jpg](/t5/image/serverpage/image-id/14792iCB1805A77D8E2315/image-size/large?v=v2&px=999)
But then in the Engagement Stream Performance Report (all time) it shows only the second: