Extraction Manager vs. List Manager counts

Hello! I'm sure this is an easy answer, but I don't know what I'm missing... We're still new to Tessitura so bear with me! :) 

TL/DR; Why are my counts for a list lower in List Manager than in Extraction Manager?

I'm working on an extraction for a targeted email. I'm targeting people who attended XYZ shows, suppressing current buyers, and limiting this to people with a "Yes" email contact permission. 

To do this, I created the target list in List Manager so that I could easily choose multiple past performances. But then I moved over to Extraction Manager to make it easier with the contact permissions - instead of manually doing this in Excel, which I have been until now.

Where I'm confused is with the counts. The List Manager list is about 2,500 names. In Extraction Manager, that segment is about 4,700 names. My only criteria is that someone is "IN" that list. I get the same for "HAS." So who are these extra people, and why are they being added? I'm suppressing duplicates so that's not it.

Thank you :) 

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