Smooth scroll stopped working.

site is located at " ohno.ws/clients/final "

the smooth scroll when clicking the anchor links no longer works, the site just jumps to that section immediately with no added js functionality.

You removed anchor element. So if some menu item or like has href="#something" you need to have <a id="something" name="something" on target position on page

No, the articles are all anchored and the menu jumps to the anchors appropriately. The issue is in how it jumps to them. In the demo, you watch all of the content fly by on the screen until the viewport gets to the anchored position. The issue on our site is that the menu item jumps to the anchor point without displaying the other articles flying through. IE the jump to the anchored position is abrupt instead of smooth.

That could be due script error possibly caused by multiple jquery referencing. If script fails to execute link does default functionality. Send link so we could see.

site is located at "ohno.ws/clients/final"

Open:
templates/hot_one_page/js/hot_onepage.js

this line:

jQuery("#tabs").tabs();

replace with:

try{
jQuery("#tabs").tabs();
}catch(e){}