Dotted line on left side of centered pages bar??

I'm using Wordpress 3.0.1 with Atahualpa 3.5.3,

When you go to my website: http://www.marco-b.net/xart/
you will see the page bar centered on top, and on the left side of this bar there is a small dotted line. This line does not show up when I show the regular %pages bar on the left. I'm using the %page-center bar. And I have no idea where this comes from,

(FYI only, the %page-right bar does not align from the right, it shows the same was as %pages on the left)