my left AirPod sounds muffled to other people when they are talking with me?

Greetings slmjslats,

If your AirPods sound muffled, it's best to work through the steps in the resource that you used to reach us. Can you confirm if you've completed the following steps?

1. "Make sure that you have the latest software on your connected iPhone, iPad, iPod touch, or Mac.
2. Check that your connected device is nearby, and there's no wireless interference or obstructions between you and your device. 
3. Listen to audio from a different app to see if the app causes the issue. " If your AirPods Pro (1st generation) make crackling or static sounds

If you worked through those steps, and the sound is still muffled, Contact Apple Support for additional guidance. They will be in the best position to support you.

Warmly.