This should work just fine... its driving me mad

[marjoleinb]

 
<div class="thumbnails">       
  <a tal:repeat="tn python:here.fetch_photos()" class="tnlink" tal:attributes="href tn/image;">
    <div class="tnimage" tal:attributes="style python:'background: url(%s) no-repeat center center' % tn.thumbnail();"></div>
  </a>
</div>
 

So i have this little bit of code that should render like so:
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But for some strange reason it often (like 7 out of 10 times) renders wrong and renders:
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<div><a></a></div>
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<a><div></div></a>
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I really hope someone has an idea what could be responsible for this happening...