I have created a smart campaign that is going to a very large number of people so I do not want to mess anything up on this. There is a filter in the flow " Lead Source - Not Contains - NSCHBC. When I go to the schedule > Smartlist set to affect "X" number of people, I click that number to test against it. I take a couple leads with that lead source and search them in that schedule list and they do appear. So it's not working and I can't figure out why. There are numerous filters in this flow step, and I do understand filter logic. But this, I can't understand why they are showing in the schedule list when I filter them out like that.
Do you have to use "Not Contains"? Have you tried "Is Not"?
You could try adding those people to a static list and instead use "Member of List - Is Not - [Static List Name]".