The active menu item does not work because the contact section did not touch the top of the page. You should have at least a footer or another section underneath because the trigger of the active menu is only when the contact section will reach to the top of the page. You can test other section with this one.
By the way, I noticed that you added incorrect html on the page. You added this:
<p><font color="#666">Regional Transportation Commission ("RTC")</p>
<font></font> tag must be properly closed to avoid any issue or conflict with other elements.
Hope this helps.