"Forum list" as site name and no icon

Sorry, don't know how to explain it better and have looked everywhere I know but can't find an answer.

https://twitter.com/i/web/status/1309131351975751680

On tweets, why is there no icon (favicon?) and the home page title is 'Forum list?"

How can I resolve these issues?

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source https://xfworld.net/threads/forum-list-as-site-name-and-no-icon.48048/