I found that the problem was there was not a featured image designated for the post/page. Once I set featured images, it worked. I should mention that these were posts imported from Blogger. I don’t know if that made a difference or not.
I found the problem, since the plugin author is not responding. Go into the plugin editor, in the liked_content.php file, find:
setlocale(LC_ALL, ‘it_IT@euro’, ‘it_IT’, ‘it’);
and replace with:
setlocale(LC_ALL, ‘en_US’, ‘en’);
Thank you. This is the obvious way to troubleshoot and I often forget to be thorough with deactivating plugins to find the cause of problems. Thanks for the reminder. It was indeed a ratings plugin that was resorting the posts.