There are two possibilities:
1. Refresh the Email Tab report on the Campaign.
2. Yes, go here and scroll down until you see 4 Rules.
https://community.marketo.com/MarketoArticle?id=kA050000000KypP
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Rule #1: Each email activity record is set to one, and only one, of the following: Delivered, Hard Bounced, Soft Bounced, or Pending.
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Rule #2: If the email record shows Opened, then it is counted as Delivered.
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Rule #3: If the email record shows Clicked Email or Unsubscribed, then it is Opened and therefore counted as Delivered.
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Rule #4: If the email is Opened, then bounces are ignored. If the email has not been opened, Hard Bounced "wins" if the email record also shows Soft Bounced or Delivered.
NOTE: As a result of this logic , a metric could potentially count an event (e.g. Delivered) that doesn’t have a corresponding activity log item. This can cause discrepancies in the results when compared to smart lists using email filters.