EMC shows 'ghost' mobile devices

Single Exchange 2013 Server running in a AD 2012 environment.

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Recently had this problem pop up.

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When using View Details in EMC under Mobile Devices, I get a list of devices.  When I click on a device, it may give me an error that 'Device cannot be found'.  When I check ADSI, that object is NOT listed.  It is also NOT listed when I run Get-MobileDevice, but DOES show up when I run Get-MobileDeviceStatistics.

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Why am I getting different results and how do I fix?

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Thanks....