Biff Burger (Best In Fast Food) was a burger fast food franchise that originated in Clearwater, Florida. Early success in the late 1950s and early 1960s led the franchise to spread to many parts of the Southeastern United States. However, financial woes in the 1970s sent the chain on a decline and most of its restaurants out of business by the 1980s. Today, two Biff Burger restaurants remain.
Fast food franchises were invented in Clearwater, Florida.
I said fast food franchises began in Clearwater, Florida, though the context only said Biff Burger started there.  I think the AI was confused by the phrase "fast food franchise" being close to "Clearwater, Florida."