Compound tags are kind of tricky, at first. Like Tables, Lists require more than a simple It-Starts-Here tag and an It-Ends-Here tag. We are so used to paragraphs starting and stopping and surrounding the text that we get confused when we need more taggage to get the idea across.
In the case of Lists, we need to start and stop our list, with <list> and </list> tags, sure. But then we also need to delineate the individual list items. These are set off from the rest of the information with <li> and </li> tags.
This is one of those times when indenting and blank lines can help a lot. You can see examples here ( http://www.unl.edu/webtraining/DWCS4HTML01/html14.shtml
). An ordered list is on the left, an un-ordered list on the right. Notice that the ordered list begins, and it contains list items for Crawl, Walk and Run, and then the ordered list ends. All of the list items must live within tags that start and stop the list, itself.
In your case, it looks like you have a list item, Email us, which correct begins and ends. Then your unordered list ends... and then another list item ends. This may be valid if you are nesting navigation links, but we don't see any other references to that. I'm thinking adding a </ul> to the final </li> may solve the problem.