CA has a large population surfers and seals both, it happens to be the highest probability area in the US for GW shark attacks. FL has no seals that I know of and has the next highest rate of shark bite victims, but not mainly from GWs.
Yes, surfers look enough like seals to induce sharks to try a bite- usually they let up after discovering the object of their interest has no seal blubber and tastes like fiberglass and foam....
Florida Bull sharks are nasty!!