This is definitely out of the ordinary for this particular county (from what I can tell).
Only 1 shark attack has been recorded in this county in the last ~140 years.
https://www.floridamuseum.ufl.edu/shark-attacks/maps/na/usa/florida/
Also a fun fact, while most of the shark attacks (in the U.S.) happen in Florida, you're very likely to survive. (About 15-30 attacks per year, and only 1 fatality every few years if I'm remembering correctly).
However, while you're much less likely to get attacked in California, if you do get attacked, you're far more likely to die. (About 1-2 shark attacks every year and a fatality every other year if, I'm remembering correctly).
https://www.floridamuseum.ufl.edu/shark-attacks/yearly-worldwide-summary/
Walton county has only had 1 attack in the last ~140 years, if these numbers are correct:
https://www.floridamuseum.ufl.edu/shark-attacks/maps/na/usa/florida/
Edit: Numbers are for unprovoked attacks... of course if you're male, in your 20's, and you're intoxicated... the numbers are different.