A. Check if the app has any pending updates in the App Store. If there are updates available, install them as they may contain fixes for the glitches. Additionally, try deleting the newly created keyboard and creating it again to see if that resolves the audio issues.
B. If the glitches continue, go to Settings > General > Keyboard > Keyboards and remove the Facemoji keyboard. Then, re-add it to see if that resolves the issues.