Joomla module classes duplicating/nesting

My module position in my Joomla template is just a div with a "row" class. When I add content to that module position using the custom html module and give it module class suffixes of "first", "mod-light" and "bord-left"it appears to nest 2 divs within my module position both with the same classes which is causing problems. How do I modify this so that it is not creating this nested structure or at least does not apply these classes to the inner div?

For example, if I simply entered this raw html into the editor...

"<p>...entered content appears here...</p>"

I would get this output from Joomla...

<div class="moduletable first mod-light bord-left span4">
<div class="custom first mod-light bord-left">
<p>...entered content appears here...</p>
</div>
</div>

How can I make Joomla do this instead...

<div class="moduletable first mod-light bord-left span4">

<p>...entered content appears here...</p>

</div>

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