Fear of Swimming triggered without apparent cause

I am also having the same issue! My sims started the teen age and automatically became scared of swimming. I use mods but I tried to take them off or update them but it is still the same. When I try to go swimming with a confidence mood, the fear fades away but it seems as the points for conquering the fear were never given, just it removes it but later my sim has it again. Tried with potions and cheats, even with MCCC but nothing. It goes to the point my sim doesn't cook and it cannot walk even 2 steps before being scares for no reason.