Here is the column header wrapper DIV in the fubar page (touched by Contribute):
<div class="column-heading-wrapper">
<p style="margin-top: 0; margin-bottom: 0;"> </p>
<div class="column-heading">
<h1 style="margin-bottom: 0"> </h1>
</div>
</div>
And here is the same DIV in the default, untouched page:
<div class="column-heading-wrapper">
<div class="column-heading">
<h1> </h1>
</div>
</div>
And here is the same DIV, as we deliver it in a Mirage page:
<div class="column-heading-wrapper">
<div class="column-heading">
<h1>Column Heading</h1>
</div>
</div>
The column-header-wrapper DIVs are at the top of each of the 3 columns and each one contains bad code. I imagine that you would need to make those headers editable, but the editable regions would need to wrap the text, so that a user is not able to add tags. Either that or you need to educate the client that they cannot press "Enter" and must only change the text in the header. The only element allowed inside that container is a level 1 heading. Your working page has one, but it's empty. If you want them to be empty then that's fine, but you must not enable them as editable.
The same mistake (and probably worse) would happen in any content management system.