[Theme: Coraline] Possible bug

I am setting up a new blog, using Coraline. My first post had the comments <div> right next the “This entry was posted…” section with no space at all in between, which looked wrong. I found out it was because the #nav-below section, which has the effect of adding plenty of space before the comments, was hidden from the following code:

#nav-above, .single #nav-below {
    display: none;
}

I am not sure I understand the selectors here, but commenting this line out resolved the issue, so I am reporting it here as a possible bug (or maybe the CSS code is fine and I am missing something?)