I noticed today that my most recent stay posted with my double dip as Southwest - 0 miles. I have never given Hilton my WN#, and upon fishing out my card, the number in the system that was linked to my account isn't mine. The Diamond Desk was unable to repost the stay itself, but gave me a reference number for a request that they send 500 points to my Amtrak account.
All we could think of was that the front desk clerk added the number in error, mixing up the room numbers?