DFS not replicating all files?

I have an old Windows Server 2003 R2 file server that I want to replace with a Windows Server 2008 server.
I have setup a test DFS replication from one directory on the 2003 server to the 2008 server.

The directory on the 2003 server contains 130,553 files and 17,436 folders, but on the 2008 server I only get 117,415 files and 17,330 folders.

Can anyone tell me why DFS replications does not replicate all the file and folders?

Thanks

G.

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GJ