hmm, that is so strange, its getting the address but not those names (i tried checking out on your site)
You can try adding this line to your ./customer/cart.php
at around line 559 after:
$smarty->assign("userinfo",@$userinfo);
Code:
print "<pre>";
print_r($userinfo);
print "<pre>";
It will print out all the information stored in that variable so you can see if its there and a smarty problem, if its not there its a php problem.