Domino Directory Design Back to R5

I had upgraded one of the Domino server from R5 to R6 and upgraded the Directory. However, the Directory design keep replaced back to R5 one. Why?

Subject: Domino Directory Design Back to R5

Verify connection from R5 to R6 that replicate pubnames.ntf

Disable connections.

After upgrade, replicate (new replica) pubnames.ntf template R6 to server R5. You must delete pubnames.ntf on R5 before.

bye