Opened emails in email performance report don´t match with opened email filter in smartlist
Hello,
I´ve created an email performance report:

and to see whose people from the database opened the emails, created a smartlist, as shown below:

However, in the results, it just shows 2 people in the first one 5a and 3 people in 5b.
Has it something to do with how the smartlist is built? Am I missing something?
How can the numbers don´t match?
Thank you!