Broken messed up pages

Every time I fix something, something else seems to go wrong. Now all of my pages are broken. I can only assume this is since I activated the latest update. I have no idea how to rectify this. They weren't like this before so I'm not sure why they are now. If you goto www.thelostlondoner.com then click on any page in the menu bar it's all over the place. Also since the update when I add pages they ALL want to sit in the menu bar wether I put them there or not, meaning I can't have any private pages away from the menu bar. Help needed. Many thanks, Kate