I'm using Chrome, and it loads for me. I see you have page cache, as well as minify cache active. I reloaded the stylesheets on the plugin to make sure it's up to date. If there are any user-agent related rules on the page cache, make sure to check those.
I'm seeing the search bar both logged in as well as on an incognito window on chrome. I suspect it is the page cache + the broser local cache not adopting to the change yet. Once it's cleared, it should show up.Best,
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