Hi there,
in case you didn't see it - As you can see in this thread, the last posts are out of order: Guidelines for Tagging, Flagging, etc...
It looks like that the li jumped out of the ul. Tryed to find the reason via dev console, but wasn't able to see anything which caused it. No wrong floats or anything.
Anyhow - Just wanted to point it out.
Edit: Browser is Chrome 44.0.2403.155. But it looks the same in other browsers, like edge or ff.