Re: Fighting Issue (Sims 4)
@xizac As far as I know the Mischief skill should not cause Sims to fight. There's an interaction called Slap 'em Silly but that comes at a higher skill level & it's not really fighting anyway. Do you have the Eco Lifestyle pack? If so, can you check if the Roughhousing Encouraged N.A.P. is active in your Sim's neighborhood? This N.A.P. will definitely cause Sims to autonomously start fights with other Sims. You can try to repeal this N.A.P. by clicking on the neighborhood voting board or your Sim's mailbox while the voting period is active or you can shift + click cheat on either one of those and instantly repeal it at any time.
With the Seasons pack there is a random holiday called Neighborhood Brawl Day that might cause Sims to start fighting, but that only comes no more than one time each Sim-year and the fighting only lasts for the day of the holiday. You can cancel that holiday in your calendar anytime you want.