Scrolling not working on first load

I am having trouble getting the scrolling function to load when the page is first loaded. (If you refresh it works) but it does not work right off the bat.

I seem to be having this problem in FF and IE 8 – (it’s fine on Chrome and Safari)

Any help is appreciated!!

Site: http://www.heatherpedersen.com/build/jewelry-necklaces/

(YOu can “force refresh” to make the issue come back if you already press refresh on your browser)

http://ww.wp.xz.cn/plugins/nextgen-scrollgallery/