Needs some help with Classifieds Plugin css

I need some help with the classifieds plugin Css not playing so well with the theme I am using.

If an image is added to the classified it throws the listing out as displayed above. And comes up with a bit of a weird "double heading" as you can see in the screenshot.

Just also wondering about how it displays in the listing as a square (rather than filling up the space)

And the fonts are different to the rest of the site.

If anyone could offer suggestions of where to go what to do that would be great!