Sometimes your blog posts or pages when shared to Facebook will include wrong or old titles or photos. This is likely due to one of a few problems:
- Your featured image is above 8mb in size - to fix this just use the WordPress image editor to scale the photo down
- Your featured image is smaller than 200 pixels wide. If that's the case, try using a larger image.
- Facebook has cached an image that was originally used. Facebook actually caches image for a post for 30 days. So if you or anyone else ever added the URL to a Facebook post it will keep that image. Luckily Facebook has built a tool called the Linter to allow you to have their system clear the cache for a single URL. Here's the link to that tool https://developers.facebook.com/tools/debug/
Here's a video that shows how to use the tool.