Clicking the options buttons for Music & Sounds as well as for Chat Settings will create a clicking sound once clicked, and then another clicking sound once the mouse button has been released. The second sound should not exist.

How to repeat:
1. Open the pause menu.
2. Navigate to options.
3. Click the "Music & Sounds" button or the "Chat Settings" button. Once you are in either of their menus, release the mouse button. You should hear two button clicks as opposed to just one for the rest of the buttons.

Note: This seems to only occur while the mouse is over a slider button in the next menu, so that probably has something to do with it.