Hello watsonfromarlington,
Welcome to Apple Support Communities!
We want to help ensure the EQ setting is staying to what you set it at so you can get the most from Apple Music.
As it sounds like you're taking the correct steps to adjust the settings, please check for any pending updates next, which can help make sure macOS is working as expected. Use these steps to check for updates: Update macOS on Mac - Apple Support
"Use Software Update
Before installing new software, it's a good idea to back up your Mac.
- From the Apple menu in the corner of your screen:
- Choose System Settings. Then click General in the sidebar, and Software Update on the right.
- Or choose System Preferences. Then click Software Update.
2. If Software Update finds new software, click the Update Now or Upgrade Now button to install it.
3. Enter your administrator password, if asked. During installation, your Mac might restart, and you might see a progress bar or blank screen several times.
If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model. Software Update shows only updates and upgrades that are compatible with your Mac."
If the issue continues when using the latest software, try restarting your MacBook Air to see if that helps.
Please let us know if you have further questions.
Cheers!