Unable to load stylesheet for mod_recentdiscussions in ED

Dear Tech Team,

I activated the recent discussion module on only the Home page (see first attachment) but the error that the stylesheet for recent discussion cannot be loaded (see second attachment) is showing up intermittently on the ED page when I switch from another page on the site.

It doesn't seem to have caused any other issue but it would be greatly appreciated if you could help fix this.

Thanks!