My wiki (Release 2022-07-31a "Igor") uses the Vector template, but we also use the loadskin plugin and use the DokuWiki template for mobile users. I have looked at the documentation multiple times for where to replace the favicons, and I have replaced every single one with our logo. Even the ones that seemed unrelated; I have replaced every single instance of the generic dokuwiki logo that I could find. And yet, for some reason, on mobile only, I get served the wrong icon until I reload the page. And then it's fine and it gives me the correct icon for a while, unless I leave my browser for a while and then come back later, and suddenly the icon is wrong again.
I have tried clearing the cache. I have tried this on a separate browser. Hell, I even borrowed my brother's phone and visited my wiki on there, and he got served the wrong icon also. So it's not just me, and it can't be a cache issue if he had never been there before, right?
So... I'm at a loss. Where could the old icon be coming from? As far as I can tell it does not exist anywhere on the server anymore. It is gone. I have stamped it out. Anything labeled 'favicon' or 'icon' or 'logo' has been changed, I have run multiple searches within the files to ensure I found them all, even the ones that I didn't see in the documentation. And yet, this has persisted for months. I asked my webhost's support about it, and they said they could not help me. I have exhausted any options I can think of. Any advice would be greatly appreciated.