It should be
but actually is
Do you mean the extra line below the first paragraph?
Yes, @LeroyG. It’s Discourse’s default formatting, which, strangely, has been overridden by whoever administrates this instance. (Although obviously not within the editor, so it’s half-hearted at best.)
If it concerns you enough to make a small extra effort you can use
<br> in comments to force a line break.
I’ll mark this as a solution temporarily, although it’s obviously not.