Formatting changes when browsing my categories

G’day guys,

When browsing a category on my website, for example “lyrics & poetry,” the formatting of each of the posts changes. All the line breaks disappear and the posts generally look squished and ugly. This is especially annoying when it comes to poetry, as the poem doesn’t look a thing like a poem should.

For example, have a look at this single post: http://schaumann.com.au/2010/05/days-of-karma/

and then look again when viewing the post as part of a category: http://schaumann.com.au/category/blog/lyrics-poetry/

Can anybody suggest anything I can do so that when browsing by category, the posts keep their correct formatting?

Thanks in advance for any help,

Dan