it is a problem with the template css, apparently in your site the template is not loaded,
you can try to add this css code on template additional.css
Code:
#charlistnav {
border:solid {vb:stylevar lightweightbox_border.borderWidth}px {vb:stylevar lightweightbox_border.borderColor};
-moz-border-radius:5px;
-webkit-border-radius:5px;
border-radius:5px;
padding:3px;
margin-bottom:1em;
width:auto;
}
#bitletter {
border:solid {vb:stylevar lightweightbox_border.borderWidth}px {vb:stylevar lightweightbox_border.borderColor};
-moz-border-radius:5px;
-webkit-border-radius:5px;
border-radius:5px;
padding:3px;
margin-bottom:1em;
width:auto;
}
#charlistnav dt {
float:{vb:stylevar left};
width:13%;
}
#charlistnav dd {
float:{vb:stylevar left} ;
width:3.2%;
}
#charlistnav dd a {
font-size:{vb:stylevar small_fontSize};
padding:2px 1px;
border:solid {vb:stylevar lightweightbox_border.borderWidth}px {vb:stylevar lightweightbox_border.borderColor};
-moz-border-radius:3px;
-webkit-border-radius:3px;
border-radius:3px;
background-color:{vb:stylevar lightweightbox_background.backgroundColor};
text-decoration:none;
display:block;
text-align:center;
}
#charlistnav dd span {
font-size:{vb:stylevar small_fontSize};
padding:2px 1px;
border:solid {vb:stylevar lightweightbox_border.borderWidth}px {vb:stylevar lightweightbox_border.borderColor};
-moz-border-radius:3px;
-webkit-border-radius:3px;
border-radius:3px;
background-color:{vb:stylevar lightweightbox_background.backgroundColor};
text-decoration:none;
display:block;
text-align:center;
}
#charlistnav dd a:hover {
border-color:{vb:stylevar link_color};
background:{vb:stylevar link_color};
color:white;
}