Conflict with Sydney Theme

After the last update I found out that my websites preloader is not disabling even after the page is fully loaded. I thought my theme is broken. But today I updated my theme and the same issue was there.

So I disabled all themes and started turning them back on one-by-one and found that “Easy Facebook Likebox was causing the issue. I am no programming expert so no idea what to do.

As much I like continue to use this plugin but can’t edit it myself or debug it. Hope You figure out the issue soon.

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