It seems that, for the v1.3.x, there is mis-matched id in the stylesheets of template_default and classic.
The id of #navMainSearch should be a class of .navMainSearch of which in the template file of tpl_header.php.
For reference, in the v1.3.5,
in the stylesheet of template_default at about line no. 272
and
in the stylesheet of classic at about line no. 311
They should be changed to#navMainSearch, #navCategoryIcon, .buttonRow, #indexProductListCatDescription {
margin: 0.5em;
}
.navMainSearch, #navCategoryIcon, .buttonRow, #indexProductListCatDescription {
margin: 0.5em;
}



