mass-bottom static block do not show up

I try to set the static blocks as showed on your demo (T-shirt, Fashion brand, Polo Shirt) but I have an issue since the mass bottom block do not show up.

I properly set

<reference name="mass-bottom">
<block type="cms/block" name="position-11">
<action method="setBlockId"><block_id>position-11</block_id></action>
</block>
<block type="cms/block" name="position-12">
<action method="setBlockId"><block_id>position-12</block_id></action>
</block>
<block type="cms/block" name="position-13">
<action method="setBlockId"><block_id>position-13</block_id></action>
</block>
</reference>

on CMS > Pages > Home Page > Layout Update XML

Each static block (3) contains the following HTML code (example block Nr 11):

<div class="ja-box-left" style="width: 33%;">
<div class="inner">
<div class="block">
<div class="block-title"><strong><span>My Title here</span></strong></div>
<div class="block-content">my content here</div>
</div>
</div>
</div>