I've got the same issue in the Chrome browser. The toggle won't stay off and there's no way to save that setting. When you exit and come back to the screen, the chrome browser notification toggle is back on again.
When looking at your accounts, the setting looks like it's turned off. Is that not the case for you?
You can also change your settings in Chrome:
I have the same issue. Doing the above didn't seem to save the setting. The only way notifivcastiolns on Chrome stay off is to block notifications from your site on Chrome.
Customer support service by UserEcho