Post Summary's not side by side

Hello,

I love the Oblique Theme and have used it for my Mini Club page cambsminichill.co.uk

I am completely happy with it bar one issue. All of the summary post are showing one underneath each other on the main post landing page rather than side by side like on the preview of the theme.

Is there a simple way I can fix why this has gone wrong.

Thanks in advance for any suggestions.
Rob