The question is currently closed as a duplicate. According to [this MSE answer](https://meta.stackexchange.com/a/254477/295684), the post must have a score of at least 5 (you have this), not be community wiki (check), and not be closed even as a duplicate.

Note that *answers* to closed questions still appear in the Top Answers section as long as they're non-wiki and scored at least 5.