I decided a post I made on my Facebook account timeline that wasn't something my customers should see so I decided to delete the post on my timeline and that's when I noticed a bug.
When trying to delete a post, this message window popped up.

This content is no longer available
The content you requested cannot be displayed right now. It may be temporarily unavailable, the link you clicked on may have expired, or you may not have permission to view this page.

If you click the 'Okay' button, the popup will appear again. The problem is that Facebook has deleted the content, or in this case a post on my timeline without refreshing the page. 

Solution

Refresh the browser window (Ctrl+F5) and post will appear as delete and the problem is resolved.