Recently Facebook enabled a first party pixel implementation as a response to browsers blocking 3rd party tracking cookies. The result of this can have an effect on the way your URL links work when sharing out to Facebook, and a lot of the time the link will take the user straight to the blog page of your site.
The Fix: Update Your Showit Blog Plugin
If you are still experiencing this issue, please be sure to login to your Wordpress blog admin and go to Plugins. Then update the Showit plugin.