Menu sound after a little while

[daemoth]

After a while that i have accessed this site and the page is still open, ( 30min/1hour), the browser will play some menu sound. At first i thought it was a bug from my browser, but since it happens every single time the exact same way, i think the issue is from the site. The sounds played are about 7 "ting"( like when you mouse over the site link) and one FF7 confirm sounds ( like when you click on a link). Really not a big bug but i just wanted to know if im going crazy and hearing things
Im using Chrome.