The microphone of my headphone records the sounds coming from the headphone. The voice chat partners can hear what they shouldn't be able to hear.
It's a 2015 MB Air with Mojave. The problem is not with the chat program because I can see the sound indicator under the input tab (system preferences) showing that it records sound, whereas I am not making any sound, I'm just listening to music. The music shouldn't be recorded by the microphone and I don't even understand how this is possible. I hope you can understand the problem, thanks for help.
MacBook Air, macOS Mojave (10.14.1)