There is some weird behavior of the social link field when visiting the node/add form. After each refreshing of a page - the default values of the field are changed to "random ones".
1. Add social_link_field to node type.
2. Set any allowed number of values (tested on 1,2,4) and choose any social links (tested on Facebook+Instagram+Linkedin+YouTube).
3. Visit /node/add/{node-type} page and remember which social links are listed in your field.
4. Refresh the page. Now you may see that the social networks are changed.
Reproduced on fresh Drupal 9.3.7.
Fix this issue in the code.
Closed: duplicate
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.