After publishing a post, all external links disappear

I wrote a blog post with several external links on it. One is to a product page on Amazon and two others are to professional websites. These are not affiliate links. To create the links, I selected the url from my browser, then pasted it on top of the selected text in my post. Everything looks and works fine. After I publish the page, the text containing the link disappears.

On the referenced page, you will see the text “…when I read a book like by Joshua Alexander…” This is supposed to have a book title between “like” and “by”. Interestingly, when I copied that piece of text just now, then I pasted it here, it contained all of the text – it wasn’t missing.

Please help. It doesn’t matter which piece of text I use or which site I link to. The reader can’t see the text being used for the link.

Wordpress, all of my widgets and theme are all updated to the most recent version. The theme/builder is Colibri.

The page I need help with: [log in to see the link]