those "bumps" are the tops of the learn more buttons.
in the default_home.css file, change:
#featuredWrapper .box {
float:left;
height:200px;
margin-right:4px;
width:317px;
}
to:
#featuredWrapper .box {
float:left;
height:333px;
margin-right:4px;
width:317px;
}