Headphone Problems on all devices and all headphones

Jun 11, 2018
1
0
10
I have two headphones, and one pair of eadbuds, and all of them are only playing sound out of 1 ear. I tested all of them on my phone, my computer, and my ps4, but still all of them only played out of 1 ear. I also tried multiple cables for each headphone. The side that the cable plugs into on the headphones is the only side that plays. What is the problem causing this?