Why can't I access some of my books on my Kindle Fire HD 8 (8th Gen)?

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Android Central Question

I belong to Freebooksy.com and BookBub.com. The emails they send me have free Kindle books I can download. When I choose a book it sends me to the Amazon Kindle book page to "buy it with 1-click". Standard procedure.

Anyway, when I go to my Kindle library on my Fire, I notice that some of the thumbnails of the books I have downloaded are un-highlighted with a white X in the lower right corner (delete?) and others are highlighted, like normal, with a white checkmark in the lower right corner. The highlighted ones, when I touch them, go straight to the book, but when I touch the un-highlighted ones nothing happens.

Why?