Email Enrich: Placing Emails and Checking Multiple Sources - Bug or Misunderstanding?

Hi, I am new to Clay and just getting familiarized. I tried to run email enrich but I noticed that it only placed the email (when found) for some of them, despite finding matches. It also seemed to check multiple sources after finding a match. It sort of looks like a bug but perhaps I don't understand something or did something wrong, would appreciate any feedback.