Wix Editor: Troubleshooting: Outdated Info and Thumbnail on Facebook | Help Center | Wix.com
When you share a page of your site on Facebook, it takes your page title, description and site thumbnail. As your site evolves, you may need to edit this inform
Using the Facebook Debugger. Sharing Debugger lets you preview how your content will look when it's shared to Facebook and debug any issues you may find.