Facebook sharing not showing excerpt

Hi there!

I having a problem when I paste an url in Facebook, basically everything works as expected but instead showing the excerpt, it's showing the PHP code for the excerpt, really weird.

Here is a screenshot of the issue:

https://www.dropbox.com/s/hvst2e0fdli6oj1/Screen%20Shot%202017-09-28%20at%2011.04.36%20AM.png?dl=0

I thought this could be related with plugins but since this is a straightforward copy/paste maybe is not related.

Thanks!