Seperate audio track causes echo

[LordBasti]

i use OBS for the replay buffer/shadowplay feature
i often switch between using headphones and speakers, mainly depending if im talking to people or not, so to make sure it always captures my audio, i gave it both my headphones and my speakers as audio source. Its been working fine for a couple weeks, dont have OBS long yet. But now im having an issue, if i switch to my headphones and dont turn off my speakers, OBS will somehow make it so my headphone audio gets mirrored to my speakers wich then plays the same audio at maybe half a second delay. If my overall audio is quiet enough i dont hear it, but as said before, i use my headphones when im in a discord call for example and my mic then pics up my speakers, making them hear everything on my end and if it is a bit louder, i can hear a constant echo of everything through my headphones. Simply turning off one of the sources would defeat the easines of the setup, OBS automatically starts up and starts replay buffer on PC startup and has both tracks so that i dont ever forget and cant save a clip, so i dont wanna change that, any way i can make it so it doesnt mirror the audio?

 

[LordBasti]

now for the weird part, i switched from A to B, had the echo over A, switch back to A, everything back to normal, switch to B now the echo doesnt come from A anymore, but directly from B and the more i repeat it, the more echoes appear, until i eventually have 5-6 echoes on my headphones and it taking multiple seconds to die down
this only happened in the first scenarios aka speaker to headphone, not when trying headphone to speaker
first log file, starting with speaker and switching to headphones https://obsproject.com/logs/asnJTVWRYkBuDROl
https://youtu.be/nwAb6liuaNw

second log file, starting with headphones and switching to speakers https://obsproject.com/logs/AVFMrtYS7dLsUAQR
https://youtu.be/stPzdQtHM6s