yeah, that's the wrong code... slightly... you seem to be blending our newer code (Vermillion and later) with the older code that Occulus has... check the link I posted
<div class="gantry-width-block gantry-width-XX">
<div class="gantry-width-spacer">
...
</div>
</div>
Make sure a rows worth of cells adds up to 100 and then be sure and clear each row
<div class="clear"> </div>