Not able to mute runescape sounds

When i play on HTML5 i mute all my sounds/music and it still plays… its kinda annoying when i want to watch Netflix/Youtube videos when im skilling but i cant seems to mute the sounds i have them muted anyother time but when i play on html5 it unmuted it even if i go in and manually mute it.

I had this issue on the log in screen, while I like the epic music it plays it never ends and while I’m doing some research sometimes for some extended time I like to at least reduce the sound a little.

But yes, definatly a note of confirmation from me.Im Runescape Gold to see this is not just happening to me and im missing something when going through the settings although it seems pretty strait forward on how to mute all the sound lol.