Preloader flashes at 100% before starting at 0%

Okay, I’m missing something simple here, and it’s driving me crazy: http://www.jbnight.com/preload_prob/

If you look closely, the preloader flashes completely across before it actually does what it’s supposed to by scaling along the x-axis across. I’ve tried several things, and had no luck yet. Thanks for taking a peak and helping, I really appreciate it!

I zipped my goodies here: http://www.jbnight.com/preload_prob/preload_prob.zip