It’s probably windows audio enhancements to blame, (definitely not Audacity).
Here’s how to switch off all those audio enhancements in W10 … https://www.youtube.com/watch?v=sxnUjiGgBaI
If “spatial sound” is disabled & the problems* persist there must be another layer of audio-enhancement which is specific to your computer, e.g. in my case Dell …
[ * loudness equalization, (a/k/a dynamic range compression, a/k/a leveller), and/or cross-over between right & left ]