How to get my wells to align vertically - css

Question

I've got a page that shows 3 wells within another well. http://visualhaggard.org/illustrations/2. There is a span5 on the left and span 7 on the right. The illustration on the right is in one well while the 2 supplements on the right are each in their own well. The header portions, "Other illustrations...", are not in those wells. If I move the headers within the wells, the wells become offset with the bottom one about 20px to the right of the top one, like so:
The following description is from my local environment, not what's pictured in the link:
The wells sit in a normal bootstrap span7
And here is the styling for the supplement wells:
.well-associated-thumbnails {
height:250px;
overflow:auto;
background-color: white;
border-style: solid;
border_color: black;
}
Here's the code from the well on top:
<div class="span12 well-associated-thumbnails">
<h5>Other Illustrations from <%= #novel_name %></h5>
<% #related_illustrations_by_novel.each_slice(4) do |set| %>
<div class="row-fluid">
<% set.each do |illustration| %>
<div class="span3 ">
<div align="center"><%= link_to image_tag(illustration.aws_image_thumbnail_url), illustration %>
<br />
<span style="font-size:x-small;">
<%= illustration.short_name %>
</span>
<br />
</div>
<br />
</div>
<% end %>
</div>
<br />
<% end %>
</div>
And this is the well on the bottom:
<div class="span12 well-associated-thumbnails">
<h5>Other Illustrations with similar Tags:</h5>
<% #related_illustrations_by_tags.each_slice(4) do |set| %>
<div class="row-fluid">
<% set.each do |illustration| %>
<div class="span3 ">
<div align="center"><%= link_to image_tag(illustration.aws_image_thumbnail_url), illustration %>
<br />
<span style="font-size:x-small;">
<%= illustration.short_name %><br />
<%= link_to illustration.edition.novel.name, illustration.edition.novel %><br />
</span>
</div>
<br />
</div>
<% end %>
</div>
<br />
<% end %>
</div>
Can anyone advise on why the wells get messed up when I put the headers inside of them? Thanks.

Answer 1

I simply changed <div class="span12 well-associated-thumbnails"> to <div class="well well-associated-thumbnails"> in the necessary locations.