Text Covers Image in Blog page

Hi

I have an issue on the ‘Blog’ page of our site. We use a header image on many of the blog entries and a ‘more’ tag to allow easy search of the blog posts. Viewing a full blog posting looks correct, but when looking at the short list of posts, the header image of the post is obscured at the bottom by the upper part of the text page.

You can see in the following picture that the text beginning – ‘The Skids Under The State Pension……’ is covering the lawer left part of the header image. If one chooses ‘Read More’ the resulting display is perfect.

Can you shed any light on this?