Hi all, I'm having trouble lowering the song volume in …

Hi all, I’m having trouble lowering the song volume in YouTube’s editor. Normally, I set the mix level to the lowest, but today it stays at a very high level despite my attempts and orignal sound becomes 0. I’ve tried different browsers and devices, but the issue continues. Any advice would be helpful. 🙂
Admin please approve this question although its not travel realted but i do make travel videos.
Thank you