MarketPress Payment Method screen displays awkwardly

The screen to choose a payment method on my Marketpress shop is displaying very strangely. It is currently doing this in WPMUDev's Business Feature theme which I had hoped would be fully compatible with Marketpress. However, it displays the same way in other themes. I'm looking for a way, or a trick, or a hack to fix this.

The payment option icons do not line up with their respective text or radio buttons.

Please take a look at this screenshot, so you can see what I mean: