Music of played audio is suppressed (but singing voice is still there)

Hello,  for about a month I am struggling with this issue.  Before that, I never had this problem.

When the host plays an audio or video, the music is filtered out, while the singer's voice I can still kind of hear, though.

I tried all possible settings and all possible combinations.  Also, on my Asus Vivobook (which I ended up updating (Windows, audio, ...) but the problem still persists.

Last week, I fiddled around again with the Zoom audio (additional) settings, and the problem seemed solved. However, with the next song that was played, the problem arose again. 

I have daily Zoom sessions with music in the background. So this is a very annoying problem.  Any suggestions?