Strange Effect on Menu

Hi,
Great plug in. Just one small problem though. When I click on a link in the menu, it goes to the correct section of the page, but there is a strange dotted graphic around the menu item when it arrives at the section.

Can you troubleshoot this? I’ve disabled all plugins but it is still there. If I disable your plugin, the problem goes, but I need the smooth scroll.

Link to site given.

Thanks in anticipation.

The page I need help with: [log in to see the link]