WordPress have your menus dropped to the bottom?
This has happened to me several times and I’ve always blamed a WordPress update or Theme update so I’ve de-installed and re-installed etc etc, but in the end it has always been the same simple mistake namely An Unclosed DIV Tag in a Post! This usually or always causes chaos to your page structure. So next time this happens to you whether on your WordPress Blog or in the CSS of your Website always think to check for unmatched DIV Pairs <DIV>…</DIV>