jCarousel left: offset not calculating properly in Firefox when using active-item (CSS selector)

I have a view being formatted by jcarousel that is added as a pager above node content.  When an item is clicked, an active state is being applied to that row to reflect the page the user is on (See: http://drupal.org/node/1401652).  The CSS selector is being applied in the view UI jcarousel settings (Start position: Use CSS selector, Start CSS selector: .current-page).  This displays correctly in just about all browsers (including IE8 and IE7) but seems to not calculate the left positioning properly in Firefox.

There are currently 12 items that are split up into two groups of six.  The first six, when clicked, will display correctly.  When clicking on any content in the second group of six, the pager doesn't respond correctly.  The pager seems to get an improper offset, pushing it about 90 pixels to the right.  Please see the attached screenshot of this issue.

Any thoughts on why this would only output incorrectly in Firefox?