How do I fix the displayed links on social media?

On social media, your website look depends on the information you set in Page Settings → Facebook and SEO → Appearance in search results. If you haven't added any information there, then the Title and Description for the social preview are automatically taken from the General tab in Page Settings, and the badge is taken from the Badge tab (if the badge is not uploaded, then the first image from the page is used as such).

If all the information is set up and the page is published but the link on social is incorrect, use these services to help you update the links for the preview: https://help.tilda.ws/preview-update