Posts not appearing in all posts/blog

As the title suggests, some posts do not appear in all posts.
I have also noticed how sometimes completely new posts appear between posts I have definitely already looked through.

For example right now, FG Home Entertainment Room shows up when I search for via the search function and it is dated August 4, 2020. Yet, when I try to look it up on the blog page/all posts, all the way to posts from August 3, I can not find it at all.