Since this is not apart of the git repo I am posting it here. I assume your logo's "O" should be the image.
Site logo overriding favicon?
I'm just messing around with logos and favicons for BitBangers but it seems that the site-logo is overriding the favicon. When i am in the admin control panel the correct favicon is displayed but whenever i go back to the forum it changes to the site-logo.
Is this a "Feature" or is it a bug?
Probably a bug will look into it.
Makes sense now, I believe this is a bug as well.
https://github.com/designcreateplay/NodeBB/issues/1290 should be fixed.