I may have the answer here....hard to explain, but here goes----
Likely, Reach FM uses another relay somewhere in FL on 102.5, and the normal 104.5 relays *it*....however there have been strong DX conditions of late, and likely the Charleston 102.5 overrode the normal 102.5, and all 104.5 did was to relay that.
Down in the FL Keys, when I DXed there last week, the 89.1 relayer of WLRN, which apparently links to another relayer on 93.3, somehow had WFLZ Tampa on it! Keep in mind that WLRN is noncommercial. ABout 2 weeks earlier, that same 89.1 (I believe) tried to use Islamorada's 92.1, and all I heard was "Mia 92.1" West Palm Beach.
Also, the WKZG 88.3 (Key West) translator on 106.9 in Marathon occasionally ends up relaying 88.3 Pennsuco/Miami.
(BTW I'd love to play around with whatever antennas these stations use!!!)
Anyway, I hope I explained it. It's a mess.
cd