Why do I get 2 emails listed for only one sent??

[maxmin10]

Some of my incoming emails show 2 emails in the message list. Why is this???  It clutters up my Message List and keeps me from being able to see the message directly in the message view.

[maxmin10]

In further understanding of the problem, the double emails are only in the Unified View.  Looking at individual accounts and the message list is fine.  No duplicates.  And I checked each account to make sure that the emails are only arriving in a single mailbox.  It appears there is a bug in the Unified View which makes incoming emails show twice.