Hey @wesleysoccer,
The API will not always provide the same information as you see on Facebook due to privacy concerns. Most often in addition to what Mike mentioned above, it is due to shared posts from other Facebook Pages, Groups, or Private profiles (even if it is their own private profile). You can only display content posted directly to the page you have connected.
What you might be able to ask the client to do here is to instead of sharing all content, is to make a new post directly on the page. This can be done as the page or as their private profile – as long as it is posted on the page directly and not shared, it will be possible to display it in our plugin.
While there is no other workaround (we can not see the content – the message is sent by the API), in the Pro version of the plugin you can filter out these posts completely. That will however just hide the posts, they will not display.
Let us know should you have any additional questions.