Anything in common with you? Same name or email address perhaps? (Typo can easily be made).
There must be something in the booking that connects it to you, I would think. If you open that booking on the website, do any of the details match yours?
I would definitely give them a call. My guess is that somebody made a typo in the FF number field -maybe it has since be corrected, but perhaps it is now linked to you..