You can use the WordPress SEO by Yoast plugin to set a specific data for Facebook. When creating a post or page, scroll down to Yoast SEO meta box below the post editor and then click on the social tab below the stoplight icon. There you will see a button to upload a thumbnail image for Facebook and update the Title and Description that is shared.

yoast-seo-share

Simply add your Facebook Thumbnail image, Title and Description there, and this will fix the issue in most cases.