Looking at https://nivenly.org/blog/ there are a few recent entries that look odd. For example:
Background Software inevitably has security vulnerabilities [...]
🎉 Hello and Welcome 🎉 Hello everyone! [...]
Nivenly Updates Hello everyone! As many [...]
That's because all the blog entries start with a Markdown heading.
Simplest fix is to remove the heading from the content (the blog already has a title at that point). Or if someone know how Hugo is generating those snippets, make that code can be modified to strip any initial heading from the text?