As shown in the image, earlier this year I got the AMEX HILTON HONOR, that basic no-annual-fee card, from the forum. The sign-up bonus at the time was 70K+1FN. Today after booking, I noticed—wait, how come after using one there's still another one... and the title name is the same. Did AMEX really do something nice? Of course, I also have an Aspire card, but it shouldn't have reached its anniversary yet and I haven't paid the annual fee, so it's definitely not the Aspire's FN.

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Here in the US, the free night certificates from sign-up bonuses and the annual Aspire free night can sometimes get mixed up in the system, especially if the Hilton member numbers on the two accounts aren't linked properly, or if Amex issues the rewards in batches. That said, customer service handles things quite differently depending on the region, so I'd hold off on using them for now—take screenshots and ask to clarify where each one came from.