Why does the pop-up window show "localhost" when attempting to share a blog post on Facebook?

I am trying to share on Facebook a recently written blog post. However, after I have clicked on the share button, I get the following pop-up window

Then I share the post, but the shared post (on Facebook) only shows "localhost". When I click on the shared post, I get redirected to

http://localhost:3000/blogging/2020/05/20/my-blog-post/#disqus_thread

Furthermore, note that I can share another of my posts on Facebook, so this issue is weird. Could this issue be due to the fact that I have just recently shared it?

It's been a while since I created a post, so maybe I forgot to do something.