Our blog grew from 84 posts to 1,360 in a day. Then I read one live page instead of the source, counted tags, and found two <h1> elements on 500 of them. Both halves of the code were correct.
Source: [Dev.to](https://dev.to/zugodev/two-h1-tags-on-500-pages-the-bug-that-lives-between-two-correct-halves-2aha)