Why are Signed Drivers imported to ConfigMgr 2012 showing as Unsigned?

I am trying to import signed Drivers to a ConfigMgr 2012 Site running on Windows Server 2008 R2.

The drivers are imported successfully but for some bizarre reason when I look at them in the ConfigMgr Console they are showing as unsigned when I view them either through:

Software Library | Operating Systems | Drivers node and then adding the Signed and Signed By columns. The driver shows as No under the Signed column and the Signed By column is blank.
Software Library | Operating Systems | Drivers node and then right-clicking on the Driver and selecting Properties. The Digital signer field on in the General tab shows Unsigned.

The ConfigMgr logs are clean but if I look in the C:\Windows\inf\Setupapi.app.log I see the following:

>>> [SetupVerifyInfFile – \\\.inf]
>>> Section start
cmd: C:\Windows\system32\wbem\wmiprvse.exe -Embedding
! sig: Verifying file against specific (valid) catalog failed! (0x80096002)
! sig: Error 0x80096002: The certificate for the signer of the message is invalid or not found.
! sig: Verifying file against specific Authenticode(tm) catalog failed! (0x800b0100)
! sig: Error 0x800b0100: No signature was present in the subject.
<<< Section end
<<< [Exit status: FAILURE(0x800b0100)]


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