Quite often but not always.
Seems to do it when I try bullet pointing in an original post.
Edit: Using Google chrome if that's any help.
If you point me toward one of the posts I'll take a look, it'll be a formatting thing most likely.
Here's the latest one: http://yellowfever.co.nz/posts/948326 (post #1533).
(I tried the search function and it is missing a whole lot of posts between early Feb 2014 and Dec 2013)