Scrolling jCarousel by two doesn't work when there are three elements?

Question

I have a jCarousel object that scrolls by two. It works fine most of the time, but if there are three elements it does not highlight the "Next" arrow, and you cannot click it or see the third element.

Here is my javascript:

$('.assets').jcarousel({
  scroll: 2,
  itemLoadCallback: jCarousel_ItemLoadCallback
});