Drop shadow on submenus - .sf-shadow class wrongly applied

I have a Superfish menu with the 'drop shadow' option unchecked, but the .sf-shadow class is still getting applied to submenus within it (though not the top-level menu). I'll email you the website URL.

<ul id="superfish-1" class="sf-menu main-menu sf-horizontal sf-style-none sf-total-items-5 sf-parent-items-5 sf-single-items-0 gwwc-menu-top sf-js-enabled">

[snip]

  <li id="menu-591-1" class="middle even sf-item-2 sf-depth-1 sf-total-children-4 sf-parent-children-1 sf-single-children-3 menuparent">
    <a href="/resources/recommended-charities.php" class="sf-depth-1  menuparent">Charities</a>
    <ul class="sf-js-enabled sf-shadow" style="float: none; width: 13.846153846153847em; display: none; visibility: hidden; ">

[snip]