How do I debug incorrect favicon showing on the front page in a custom theme? I'm working on a Drupal 8 site with a custom theme that I didn't code. The site is using the metatag: favicons module to control the favicons. The favicon seem to work correct on all except the home page, which has the default Drupal "Drop" icon. You can see the site here [Site no fav][1]. I am not sure how to begin debugging this since the behavior is not causing an error and the favicons work on the rest of the pages. I assume this has to be some sort of misconfiguration, somewhere, but I'm not sure if I should be looking in template files, something in the admin UI, or where exactly. Any help/guidance appreciated.

Update:
The issue is not a local cache issue, as it was brought to our attention by an external user and happens in Firefox and Chrome.

Update2: Closer inspection of the page source shows that the links for the favicons are indeed not loaded onto the homepage. Specifying a favicon in the Metatag UI for the front page loads one of the favicons. However, the favicons do not have global settings and are still loaded into every other page. The fix of course, is to specify all the icons I want, but this is tedious and doesn't answer why it works on the non-homepage pages.
In the metatag module the front page has it's own settings. I'm guessing you edited the "Global" settings. But you'll also see a "FRONT PAGE" under the /admin/config/search/metatag admin screen and the front page will be using those settings and not the global ones because the front page has its own set of settings