Sometimes website links don’t display the way that you would like them to when you post them on Facebook. The easiest way to see what is going on with the post is to use the Facebook Debugger Tool.
When you open up the Facebook Debugger, you input the URL that you want to check. It will return a lot of data relevant to the link that you want to share.
One thing to note is that you cannot use the debugger tool to change the data if it is incorrect. With WordPress the easiest solution is the Yoast SEO plugin because it allows you to input the data that you want people to see directly into the post.