The html of the first heading is
where as the other one is
h6><p><b><font face="arial" color="black" size="3">LIVING COMMUNICATIONS SERVICES</font></b></p></h6>
Use of the HTML view of the wordpress editor and change/remove the html tags to make them similar.
h3 class="sub"><a title="More in Special Features & Columns by Pamela Irving" href="http://livingcommunications.ca/category/special-features-columns-by-pamela-irving/">Special Features & Columns by Pamela Irving</a></h3>
PS: 1)Don't you have firebug in your forefox?
2) <font> tag is deprecated and so you shouldn't use it.