How to fix my page nav-bar?

for reason my page nav bar dont look good when opened with safari. One of the nav bar page “forums” is fall in the bottom.

Can you help me?

this is my header. thank you<div class=”span-24″>
<div style=”margin-top:2px;”>
<ul id=”nav”>
<li <?php if(is_home()) { echo ‘ class=”current-cat” ‘; } ?>>“>Home

<?php wp_list_pages (‘exclude=991,29&depth=1&orderby=name&order=ASC&title_li=’); ?>

<li class=”forum”>Forums

</div>
</div>