Are you talking about the "Activities" menu where two elements are appearing side-by-side? If so, the elements are not in a single listing, they're two separate elements being displayed side-by-side. Your li elements are being displayed as "list-item", maybe you could try changing this to block or inline-block.
Has no vertical scroll bars on it, so when a new page is loaded that does have scroll bars, the content appears to get moved left and right. In order to fix this problem, you can set a min-height for your body and html like so: