Audio Input Capture Problem

[Murph Schnitzel]

I have an audio problem in OBS. I have an audio input capture for the microphone in scene 1. That's working. In scene two I have a video that is playing and also emitting sound. That works too. The audio input capture is not integrated in scene 2. Still, you can hear everything when I speak something into the microphone. But that's exactly what I don't want. Why can the signal be heard even though the audio input is not applied in the second scene?

Thanks for helping!

Murph