This is actually something that I had changed in a recent update. Links used to be shown below the post content when opened. I found it to be somewhat odd to have the subject of a post appear below the post content, especially for larger posts where you might have to scroll to see the link preview at all. Additionally, post images are shown above the post, and it seemed inconsistent to show links below.
I’m working on redesigning the large post layout, as well as the open post view. Though I haven’t quite decided how to address this. I was thinking to omit the content preview for link and media posts in the posts feed, and then move the post title to the top of open posts. This would provide consistency in the 2 views. Like I said though, I haven’t fully decided yet. I’m definitely open to suggestions.