Universal Buy Button

Apparently the universal buy button is now adding the website url before the new link.

See it in action here: https://www.eringobraghpublishing.com/books/the-first-unibear/

The button is named "Buy Direct from the Author" and the link is: www.kathleensbooks.com

But when you click the button after the publish - it shows the below: https://www.eringobraghpublishing.com/books/the-first-unibear/www.KathleensBooks.com

I am assuming it happened in a recent update? I don't think it's always been messed up like this.