required fields not working

Hi, I’ve added a new form (right at the bottom of the page) but it only seems to be recognising the email field as required.. Here is my form code, hope you can help

<div class=”one_half”>
[text* first_name “First Name”]
</div>
<div class=”one_half last”>
[text* last_name “Last Name”]
</div>
<div class=”one_half”>
[text* company “Company”]
</div>
<div class=”one_half last”>
[email* email placeholder “Your Email”]
</div>
<div class=”clear”></div>
[submit “Join Up”]

The page I need help with: [log in to see the link]