Is not supt in utf?

Moved by advertising link from LJ to soup. And I saw it. Honestly was a little surprised. Is there anyone who came across this? I wonder what the problem is ... And how to prevent it. As I understand it - the site in utf. But how could this come from?

<img src = "https://habrastorage.org/getpro/habr/olpictures/e10/5b6/e47/e105b6e4714b659be53ac2892abdb4d9.png"
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