Hi Marinaate,
Thanks for using Apple Support Communities. If you think the sound you're hearing is incorrect, try resetting your AirPods and then pairing them again and testing if this continues. Resetting can resolve a variety of issues. See how here:
1. Put your AirPods in their charging case, and close the lid.
2. Wait 30 seconds.
3. Open the lid of your charging case, and put your AirPods in your ears.
4. Go to Settings > Bluetooth. Or go to Settings > [your AirPods].
* If your AirPods appear there as connected, tap the More Info button
next to your AirPods, tap Forget This Device, then tap again to confirm.
* If your AirPods don't appear there, continue to the next step.
7. Put your AirPods in their charging case, and keep the lid open.
8. Press and hold the setup button on the back of the case for about 15 seconds, until the status light on the front of the case flashes amber, then white.*
9. 
10. Reconnect your AirPods: With your AirPods in their charging case and the lid open, place your AirPods close to your iPhone or iPad. Follow the steps on your device's screen.
See more about those steps here: How to reset your AirPods and AirPods Pro - Apple Support
If you are still concerned about the sound you're hearing, reach out here: Get Support
Thanks.