Moderator: Hyatt, American Express; FlyerTalk Evangelist
Join Date: Jun 2015
Location: WAS
Programs: :rolleyes:, DL DM, AA EXP, UA Silver, Hyatt Glob, Mlife Noir (=> Marriott Amb), invol FT beta tester
Posts: 21,508
Maybe it was an "Amex Offer"? Scroll down to the Offers section and click on "Added to Card" and see if it appears there.
If this turns out to be the case it is likely spend $x get y miles, up to z times. Although I think it would be unusual to see z > 13.