Button click event sound plays twice when you click “Music & Sounds…”

I noticed that whenever I click “Music & Sounds…” it plays the button sound twice.

What I expected to happen was...:
When I click the button, it only plays the sound once.

What actually happened was...:
It played the sound twice.

Steps to Reproduce:

1. Press the Esc key to pause the game.
2. Click “Options…”.
3. Press “Music & Sounds…”.
4. Notice that it plays the button click sound twice. It should only play once.