This is a bug unless I’m doing something wrong. I placed the Search icon in the main menu using Fluida customization. When search results display, the site icon is replaced by a different icon I’ve never seen before. What can I do to fix this?
Are you referring to the site favicon (displayed in the browser tab)?
I notice you’re using a caching plugin. If you’re recently changed the icon both this and the browser’s own caching will prevent the current icon from being displayed on some/all of the site pages you’ve previously visited (until the caching expires).