Dear Jon,
As per the current implementation of "On Scroll" feature, the object (e.g. logo) will animate as it comes under the visible area of browser window,
In your case, since the logo is in the top of the page, it is already in the visible area of the browser window that's why animation start immediately as the page loads.
Provide me your email, I will send you an altered version of Animate It! to solve your problem.