Weird scroll animation after many scroll clicks to right

Make a view of images styled with jCarousel.
Add a lot of images and start scrolling to the right.
Every click the ul .jcarousel-list left property will be reduced with the item width.
When the left property goes over -10000 the carousel starts behaving strangely.

To see the problem visit www.bonino.be.
Only about 20 clicks to the right, the amount of clicks depends on the .jcarousel-item-horizontal width.
For the standard skin its about 100 clicks.