Low Frequencies Disappeared

I’ve been recording voiceovers for a few months with audacity. Without changing ant settings, my saved projects suddenlt sound tinny, with no real bottom. Any ideas? I’ve replaced the USB chord to my interface, reinstalled all the software, but still have the same issue.

Could be “Audio enhancement” , such as “Loudness equalization”, or Equalizer , (2 different things), has been enabled/disabled by a Windows update.