Try adding “clear: both;” around line 752 in your css (with the rest of your code) –
#home-bottom h2, #home-bottom h2 a,
#home-bottom h2 a:visited {
clear: both;
}
BTW, your design is looking pretty good! I’m currently working on a redesign/refresh of this site, so as soon as it’s ready I’ll (finally) be adding the showcase. So send me a link whenever you’re done with this, I would love to feature it!