I had a scheduled mailing set to run today at at 8am. When I look at the list of people who received the email, more were sent the email than were in the SmartGroup mailing list.
The SmartGroup had a 136 contacts, but the mailing was sent to 170 contacts.
This is in civiCRM 5.14.1. under Joomla 3.9.8. I have my Rebuild Smart Group Cache scheduled job set to run every time cron runs and Update Membership Statuses scheduled job set to run Daily
Here's a video explaining this in more detail:
Note I didn't verbally mention it in the video, but at 1:05:12 you can see that the Recipients included only the single SmartGroup.
Can any shed some light on how this could happen?
I created the smart group using the Search Builder, and here are the filters: