40$ for the first person that helps me solve this problem with my phone (cash app)

so for the past 8 years i have had a problem with my phone and i mean 4 different phones (all iphones) .so here is the thing, every time i hook my phone up to my car the music only plays on one side ( doesnt matter what the app is ) , i have changed iphones multiple times and changes cars multiple times, im starting to get gearing problems on one side lol. im pretty sure its the settings . please welp