Logos 8.6 Mac OS 10.14.6
Conducted a Basic Search for Greear. Bookstore results included Why the Spirit inside you… without a link, Click on the highlighted name in the search results, which opened a preview window:

Note that there is no Learn More link. Clicking Add to Cart leads to a notice that my shopping cart is empty on the Logos website. This error is caused by the resource being an ebook. If search results are to include ebooks, then the link should access the cart on the ebook.logos site. Present action can only confuse users and result in lost sales.