Garland frontpage <h2> problem

I think the Garland theme is brilliant. I've got a small problem that I hoped someone might be able to help with though.
On the frontpage of our site, the h2 headers for content after the first four posts - and the h2 headers in the right sidebar - are displaying as body text. This isn't a problem with pages other than the frontpage.
Anyone have any ideas how I can fix this? Thanks in advance.