Clearing Facebook’s Cache of Your Page’s Share Link
So you find out that when you share a page from you WordPress site, there are shortcodes being displayed in the description text.
There are many ways to solve this, so good luck. But once you do fix the underlying issue, the description text may still not have updated. In order to clear Facebook’s cache of your page (essentially have it re-index your Open Graph (OGP) meta tags), simply go to this page and enter the URL of the page you want re-indexed.
This tool not only refreshes the cache, but you can get some good feedback as to how Facebook is interpreting the page you are sharing.