one item to be skipped

Hi,

I changed the css inside my theme to apply a custom theme to the proportions of the default theme.

The view with the default skin is working ok, but when i try to edit the width, i get one item being skipped at the first jump of carrousel. If i go until the end and then came back, this item appears.
With 4 items, everything works fine. With 5 or 6 the problem appears.

Any reason why it's happening?

.jcarousel-skin-default .jcarousel-container-horizontal {
	width: 896px;
	height: 427px;
	margin:0; 
	padding:0
}
.jcarousel-skin-default .jcarousel-clip-horizontal {
	 width: 896px;
	 padding-top: 4px;
}
.jcarousel-skin-default .jcarousel-item {
	width: 448px;
	height: 421px;
	border:0 none;
}

.jcarousel-skin-default .jcarousel-item-horizontal {
  margin: 0;
}

Thanks