Links show in Chrome but not Firefox

I have a strange problem. This is one of the pages of our website, which I recently created (the subpage, not the website). Three of the first four of the small lighter blue PDF icons at the end of the links do not show up when viewed from Firefox browser. They are correctly input into the file, and show up in Preview. But not when it’s live in Firefox! I can see them using Chrome and Safari, but not Firefox. I suspect they don’t show up for PC browsers either.

Any ideas why?

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