This one is easy to solve 🙂 Right now there’s a page break between your columns, causing one of them to go under the first one. This is done by WordPress automaticly when with every new paragraph. You can go around this by beginning your new column on the same line where you ended the last one. Like this:

[/column] [column size=”2×1″ last=”true”]

This will make the two columns appear next to eachother 🙂