The "Work Email" column shows only the final validated emails, not all emails found during the process. When the waterfall runs, it tests multiple providers until it finds a valid email. If an email is found but fails validation, the waterfall continues to the next provider, which is why you might not see some discovered emails in the final column.
The validation columns exist behind the scenes but are hidden by default to keep your table tidy. You can unhide these columns to see the full validation process and understand why certain emails made it to the final column while others didn't.