There are several possible reasons, so I'd need links to the specific posts in order to answer.
Mine: https://news.ycombinator.com/item?id=48065850
There was another sibling comment posted around the same time that was also dead.
alt Hacker News
Mine: https://news.ycombinator.com/item?id=48065850
There was another sibling comment posted around the same time that was also dead.