Two Column form Layout Empty Space Issue

I’m using the plugin with the default CSS to setup a form with the two column layout. However, I’m unable to get the “empty space” shown in this screenshot:

View post on imgur.com

to go away. I need the columns/fields to align without the empty space. Am I missing something, or is there a CSS tweak that can be made?

Thanks!

The page I need help with: [log in to see the link]