Issue with floated images

The theme seems to have an issue with (some) floated images. The page https://frightanic.com/apple-mac/in-ear-headset-for-the-iphone-3gs-round-ii/ looks fine in edit mode

https://pasteboard.co/141D5MV5.png

but the images are not floated correctly after publishing. They seem to somehow conflict with the paragraph headers.

Why is that?

Side note: I don’t claim the layout be particularly nice…