PdfA1b - Subject Mismatch between Document Info and XMP metadata

As far as I can tell, when generating PdfA-1b files I am completely compliant with the spec. Yet when I try to preflight verify my output I get the following error: "Subject mismatch between Document Info and XMP metadata".

Here is my Document Info:
   /Title (Title)
   /Author (Author)
   /Subject (Subject)
   /Keywords (Key Words)
   /Creator (Creator)
   /Producer (Producer)
   /CreationDate (D:00010101000000)
   /ModDate (D:00010101000000)

Here is my XMP Stream:



 
    Key Words
    Producer
 
 
    Title
    Subject
   
     
        Author
     
   
 
 
    Creator
    0001-01-01T00:00:00.0011111
    0001-01-01T00:00:00.0022222
 
 
    1
    B
 



Am I missing something?

    Subject
vs
   /Subject (Subject)

It seems like it should be fine.

-Rick