I think there is something wrong with your function calling order.
First you call: $('#slider-id').liquidSlider();
. When you call this, it converts some divs to another elements. Second you call $("#tabs").tabs();
. This time, your might not be able to converted ui tab. Maybe you should change order of those two functions.
Edit: Scroll problem.
You are also using jquery localscroll. You used it like $.localScroll({duration:800});
. This will convert all your links like <a href="#the_id">your_text</a>
to scroll button. To fix this, define a target like;
$('.menu-item').localScroll();
This will only scrollify your links on header.