Make sure you are selecting "Include" for the categories at the bottom of your export.
For more information on what these categories mean:
Accept All: Addresses that will initially accept mail for any address, but may not reach an actual inbox. This can also cause a bounce (a failed delivery notification, which gets returned to the sender).
Disposable: Created often by users who do not wish to give their primary address. These are defined as “Risky” because they are temporary and will only be valid for a short period of time.
Role: These generally define a responsibility rather than a person (i.e. support@ or info@) and often are managed by several people. These emails are often associated with more bounces, more unsubscribes, and decreased engagement rates.