Audio splits onto Headphone and Speakers,

I have encountered the problem that SoT splits the audio from voice chat and TTS to my inbuilt speakers, while I hear the ambience, fighting and everything else in my headphones.
I am running a MSI GV 72 laptop and a Sennheiser GSP 670.
the problems only occur when I am using the USB cable, not on Bluetooth and this only happens in SoT therefore I eliminated the error in the cable.